MEMORANDUM OPINION

ROBINSON, District Judge.

I. INTRODUCTION

In March 2007, plaintiff Weyerhaeuser Company ("Weyerhaeuser") sold its fine paper business to Domtar Corporation and Domtar Paper Company, LLC (together, "Domtar") pursuant to an Amended and Restated Contribution Agreement (the "Contribution Agreement") and an Amended and Restated Transaction Agreement (the "Transaction Agreement"). (D.I. 14, Exs. A-B) After closing, disputes arose between the parties regarding the operation of several contract terms. Nevertheless, no lawsuit was brought to resolve any dispute until January 2014, when Weyerhaeuser filed a complaint contending that Domtar breached its contractual obligations regarding workers compensation liabilities. (D.I. 1)

The court held in a prior opinion, issued on July 30, 2014, that Section 2.03(a) of the Contribution Agreement obligates Domtar to assume liability for workers compensation claims of employees of the fine paper business who had retired or left employment with Weyerhaeuser and thus never became employees of Domtar (the "Retired Employees").1 (D.I. 18 at 8) Domtar has raised two equitable defenses: waiver and acquiescence. Currently before the court are the parties' cross-motions for summary judgment on Domtar's equitable defenses. (D.I. 50, 55) The court has subject matter jurisdiction over this action pursuant to 28 U.S.C. § 1332(a). For the reasons discussed below, Weyerhaeuser's motion for summary judgment is denied and Domtar's motion for summary judgment is granted.

II. BACKGROUND

A. Relevant Contract Provision

The Contribution Agreement and Transfer Agreement were executed on January 25, 2007. (D.I. 14, Exs. A-B) Both agreements are governed by Delaware law. (Id.) Section 9.10 of the Contribution Agreement prohibits non-written waivers or modifications to the agreement. Specifically it states:

(D.I. 14, Ex. A. at 52)

B. Post-Closing Dispute

The sale of the fine paper business closed in March 2007. (D.I. 56 at 3) Almost immediately thereafter, the parties disagreed about their obligations under the sale contracts, including workers compensation liabilities. (Id. at 4) In April 2007, Weyerhaeuser assigned $13,594,814 in workers compensation liability to Domtar, as part of a proposed post-closing working capital adjustment. (D.I. 51 at 4) Domtar objected that it never assumed that entire liability. (D.I. 56 at 4-5) In an email dated April 23, 2007, Domtar employee Michael Cross told Weyerhaeuser that he had "done a tour of the parish on this issue," and it was Domtar's "collective understanding that [workers compensation] is not a liability that belongs to Domtar Corp." (D.I. 51 at 4) Weyerhaeuser disagreed, and told Domtar that Weyerhaeuser would make workers compensation payments on Domtar's behalf until the issue was resolved. (Id.)

On June 6, 2007, Domtar's general counsel, Gilles Pharand, wrote to Weyerhaeuser's general counsel, Sandy McDade, to memorialize its objection to the allocation of $13,594,814 in workers compensation liability to Domtar. (D.I. 51 at 4) According to Weyerhaeuser, "[w]hen McDade responded, he identified the contract provisions that assigned liability to Domtar, and outlined the same contract analysis later applied by the Court" in its July 2014 opinion. (Id.) Weyerhaeuser then began to invoice Domtar for workers compensation claims that included payments for Retired Employees. (D.I. 56 at 5) Domtar refused to pay these invoices. (Id.) Weyerhaeuser acknowledged in October 2007 that "Domtar and WY do not agree on the treatment of certain US workers compensation liabilities" and that "the issue remains to be resolved." (Id.)

C. The September 11, 2008 Montreal Meeting

By mid-2008, Anne Giardini, general counsel for Weyerhaeuser's Canadian subsidiary, took over responsibility for negotiating the post-sale disputes. (D.I. 51 at 4) In a June 3, 2008 letter to Domtar, Giardini summarized Weyerhaeuser's positions on several open issues and asked for a meeting to discuss them. (D.I. 56 at 5) The letter reiterated Weyerhaeuser's position that the sale contracts allocated all workers compensation liability for fine paper employees to Domtar, and claimed that Domtar owed Weyerhaeuser $3,543,789 for workers compensation payments already made on Domtar's behalf. (D.I. 51 at 5)

Domtar responded on July 11, 2008. (Id.) Zygmunt Jablonski, Domtar's vice president for legal services, agreed to meet with Weyerhaeuser, and asked Giardini to explain how Weyerhaeuser was calculating workers compensation liability. (Id.) In a follow up letter dated September 8, 2008, Jablonski told Giardini that Domtar had "assumed certain workers compensation claims with respect to the Transferred Employees," but that there was "no requirement anywhere in the Transaction Documents for Domtar to pay Weyerhaeuser for any accounting accrual for a Newco Liability." (Id.) In other words, Domtar agreed to make workers compensation payments for Transferred Employees, but it did not agree to accept responsibility for Retired Employees. (Id.)

On September 11, 2008, Domtar and Weyerhaeuser met in Montreal to discuss the open issues. (Id.) Weyerhaeuser was represented by Giardini and Patrick Lane, the transition manager for the sale. (D.I. 56 at 6) According to Weyerhaeuser, "Domtar took the position it unsuccessfully advanced in this litigation — that the Sale contracts made it responsible only for Transferred Employees." (D.I. 51 at 5) According to Domtar, Weyerhaeuser's representatives agreed at the meeting with Domtar's position, "but said they needed to discuss it further internally."2 (D.I. 56 at 6) Weyerhaeuser does not dispute Domtar's assertion. At her deposition, Giardini testified that, during the meeting, she found Domtar's arguments persuasive. (D.I. 51 at 5)

On September 23, 2008, Giardini wrote Jablonski that, after making internal inquiries, she had been "advised that Weyerhaeuser has been invoicing Domtar only for Workers' Compensation for transferred employees." (D.I. 56 at 6) This was factually incorrect, which Giardini would later discover. In October 2008, Weyerhaeuser formally changed its accounting records to reflect a $9.2 million reduction in the workers compensation liability it claimed from Domtar and a $3.4 million decrease in the "outstanding WC receivable balance," because "a significant number of claims will remain with Weyerhaeuser." (D.I. 74 at 3-4) This accounting change was approved by Jeanne Hillman, Weyerhaeuser's chief accounting officer. (Id. at 4) That same month, Lane instructed the human resources department to notify Domtar that new invoices would be issued, because "workers compensation liability went to Domtar only for employees that showed up to work at Domtar." (D.I. 56 at 6-7 (emphasis in original))

On November 26, 2008, Giardini sent Jablonski a letter correcting her September 23 letter and confirming that prior invoices had improperly included claims by Retired Employees. (D.I. 56 at 7) She then stated, "In fact, we are all agreed that US workers compensation liability went to Domtar only for employees who became able to work in some capacity at Domtar." (Id.) The letter is marked "without prejudice" in the header on the first page. (D.I. 51 at 6) Weyerhaeuser thereafter sent Domtar a list of only the Transferred Employees and issued revised invoices that included only claims for Transferred Employees. (Id.) For approximately three years after Giardini's letter, Weyerhaeuser invoiced Domtar only for claims filed by Transferred Employees, and Domtar paid those invoices. (D.I. 51 at 7)

At her deposition, Giardini explained that her statement in the November 26 letter was based on her mistaken interpretation of the Contribution Agreement. She testified: "The conclusion that workers' compensation liability went to Domtar only for employees that showed up to work at Domtar is mistaken advice from me ... based on ... [a] misreading of the agreements." (Id. at 6) Giardini said that she was focused on the wrong contract provisions. (Id.)

In June 2009, Giardini sent Jablonski a list of "issues for resolution" to be addressed at a proposed meeting (eventually held in December 2009). (D.I. 56 at 8) Under the heading "U.S. Employees on Workers Compensation," Giardini stated that administration of the workers compensation files remained at issue, but "all past workers compensation invoices have been reconciled." (Id.) Thus, Weyerhaeuser represented that liability for workers compensation was not an open issue. Settlement of the remaining issues were memorialized in a settlement agreement executed on December 21, 2009. (D.I. 53, Ex. O)

In January 2012, Weyerhaeuser resumed invoicing Domtar for Retired Employees workers compensation claims. (D.I. 51 at 8) Domtar rejected these invoices. (Id.) Weyerhaeuser did not explain what led to its change in position other than that it discovered its mistake interpreting the contract. (D.I. 67 at 4)

III. STANDARD OF REVIEW

"The court shall grant summary judgment if the movant shows that there is no genuine dispute as to any material fact and the movant is entitled to judgment as a matter of law." Fed. R. Civ. P. 56(a). The moving party bears the burden of demonstrating the absence of a genuine issue of material fact. Matsushita Elec. Indus. Co. v. Zenith Radio Corp., 475 U.S. 574, 586 n. 10, 106 S.Ct. 1348, 89 L.Ed.2d 538 (1986). A party asserting that a fact cannot be-or, alternatively, is-genuinely disputed must support that assertion by citing to "particular parts of materials in the record, including depositions, documents, electronically stored information, affidavits or declarations, stipulations (including those made for the purposes of the motions only), admissions, interrogatory answers, or other materials," or by "showing that the materials cited do not establish the absence or presence of a genuine dispute, or that an adverse party cannot produce admissible evidence to support the fact." Fed. R. Civ. P. 56(c)(1)(A) & (B). If the moving party has carried its burden, the nonmovant must then "come forward with specific facts showing that there is a genuine issue for trial." Matsushita, 475 U.S. at 587, 106 S.Ct. 1348 (internal quotation marks omitted). The Court will "draw all reasonable inferences in favor of the nonmoving party, and it may not make credibility determinations or weigh the evidence." Reeves v. Sanderson Plumbing Prods., Inc., 530 U.S. 133, 150, 120 S.Ct. 2097, 147 L.Ed.2d 105 (2000).

To defeat a motion for summary judgment, the non-moving party must "do more than simply show that there is some metaphysical doubt as to the material facts." Matsushita, 475 U.S. at 586-87, 106 S.Ct. 1348; see also Podobnik v. U.S. Postal Serv., 409 F.3d 584, 594 (3d Cir.2005) (stating that party opposing summary judgment "must present more than just bare assertions, conclusory allegations or suspicions to show the existence of a genuine issue") (internal quotation marks omitted). Although the "mere existence of some alleged factual dispute between the parties will not defeat an otherwise properly supported motion for summary judgment," a factual dispute is genuine where "the evidence is such that a reasonable jury could return a verdict for the nonmoving party." Anderson v. Liberty Lobby, Inc., 477 U.S. 242, 247-48, 106 S.Ct. 2505, 91 L.Ed.2d 202 (1986). "If the evidence is merely colorable, or is not significantly probative, summary judgment may be granted." Id. at 249-50, 106 S.Ct. 2505 (internal citations omitted); see also Celotex Corp. v. Catrett, 477 U.S. 317, 322, 106 S.Ct. 2548, 91 L.Ed.2d 265 (1986) (stating that entry of summary judgment is mandated "against a party who fails to make a showing sufficient to establish the existence of an element essential to that party's case, and on which that party will bear the burden of proof at trial").

IV. DISCUSSION

The court has construed section 2.03(a) of the Contribution Agreement to mean that Domtar is obligated to pay the costs of workers compensation claims for Retired Employees. (D.I. 18 at 8) Domtar argues, however, that Weyerhaeuser waived this contractual right and acquiesced to Domtar's position that it was not responsible for these workers compensation claims. (D.I. 56 at 10-17) Because Weyerhaeuser raises the same arguments against both waiver and acquiescence, the court will address the defenses in parallel, rather than separately. The court, however, is not treating the defenses as interchangeable.

Before the court can address Weyerhaeuser's substantive arguments, it must resolve two preliminary issues: (i) whether Domtar can argue acquiescence when it did not plead the defense in its answer, as required by Fed. R. Civ. P. 8(c); and (ii) whether Section 9.10 of Contribution Agreement requires any waiver or acquiescence to be in writing. Neither issue eliminates Domtar's defenses. Thus, the court will establish the proper elements of waiver and acquiescence, determine whether waiver or acquiescence occurred here and, if so, whether the waiver was retracted.

A. Rule 8(c): Preserved Defenses

Under Fed. R. Civ. P. Rule 8(c), an affirmative defense should be asserted in the appropriate responsive pleading.3 Eddy v. V.I. Water & Power Auth., 256 F.3d 204, 209 (3d Cir.2001). But "the failure to do so does not automatically result in waiver." Id. "Even though a motion for summary judgment is not the most appropriate way to raise a previously unpled defense," Kleinknecht v. Gettysburg Coll., 989 F.2d 1360, 1374 (3d Cir.1993), "a defendant does not waive an affirmative defense if he raised the issue at a pragmatically sufficient time, and the plaintiff was not prejudiced in its ability to respond." Eddy, 256 F.3d at 209.

The court finds that Domtar raised its acquiescence defense at a pragmatically sufficient time. Weyerhaeuser was able to address acquiescence in its summary judgments briefs and, if necessary, can further respond to this defense at trial. See Pantzer v. Shields Dev. Co., 660 F.Supp. 56, 61 (D.Del.1986) (finding no prejudice where plaintiff was able to address the affirmative defense in its answering brief); Kleinknecht, 989 F.2d at 1374 (allowing unpled affirmative defense to be considered on summary judgment); Charpentier v. Godsil, 937 F.2d 859, 863-64 (3d Cir. 1991) (allowing unpled affirmative defense raised in post-trial motion).

In addition, Weyerhaeuser has not been prejudiced by Domtar's acquiescence arguments. Weyerhaeuser noted that "fact discovery has been closed for months," but did not claim that it would have sought any particular discovery different from what it already obtained. (D.I. 67 at 8) In fact, Weyerhaeuser made no claim of prejudice at all. This is unsurprising because, as the parties admit, waiver and acquiescence are doctrinally similar and rely upon the same facts. (See D.I. 67 at 9 n. 6 (Weyerhaeuser concedes that "Delaware courts have likened acquiescence to waiver"); D.I. 74 at 7 (Domtar asserts that it "relies upon the same facts to demonstrate both."))

Several Delaware cases demonstrate the lack of prejudice to Weyerhaeuser. In Norberg v. Security Storage Company of Washington, the court ruled against plaintiff on the basis of acquiescence and waiver, even though neither were pled in the defendant's answer. 2000 WL 1375868, at *1 (Del.Ch. Sept. 19, 2000). In that case, defendants moved for summary judgment based only on acquiescence. Id. The court allowed the defense to proceed, despite a rule equivalent to Fed. R. Civ. P. 8(c), because there was no prejudice to plaintiff when the defense was based on his own conduct. Id. at *5. In addition, the court ruled against plaintiff based on waiver, even though waiver was "not argued by the parties in their briefs or at oral argument," because the same conduct that supports acquiescence "also fits squarely within the doctrinal parameters of waiver." Id.; see also Pepsi-Cola Bottling Co. of Asbury Park v. Pepsico, Inc., 297 A.2d 28, 33 (Del.1972) (acknowledging that the trial court ruled against plaintiffs based only on waiver but affirming based on acquiescence because the factual findings supported acquiescence). The cases of Norberg and Pepsico support the court's conclusion that, although Domtar's actions do not conform to best litigation practices, it has not waived its acquiescence defense.4

B. Section 9.10: Writing Requirement

Weyerhaeuser argues that Section 9.10 of the Contribution Agreement requires any waiver or acquiescence to be in writing. (D.I. 51 at 13; D.I. 67 at 9) That section states that no provision of the contract "shall be deemed waived, amended, supplemented or modified" unless the waiver "is in writing and signed" by an authorized representative of the waiving party. (D.I. 14, Ex. A) Section 9.10, by its own terms, does not mention acquiescence, only waiver. Nevertheless, Weyerhaeuser contends that Section 9.10 is equally applicable to acquiescence, because acquiescence is a type of waiver.5 (D.I. 67 at 8-9) Assuming Section 9.10 is applicable to acquiescence, the court finds that the writing requirement can be waived for the same reasons it could always be waived with respect to waiver.6

Delaware law allows a no oral waiver provision to be waived by oral statements or conduct. As then-Vice Chancellor, now Chief Justice, Strine explained, "it is settled law that contract provisions deeming oral modifications unenforceable can be waived orally or by a course of conduct just like any other contractual provision." Eureka VIII LLC v. Niagara Falls Holdings LLC, 899 A.2d 95, 109 n. 26 (Del.Ch. 2006) (quoting Continental Ins. Co. v. Rutledge & Co., Inc., 750 A.2d 1219, 1229 (Del.Ch.2000)). "If a provision requiring written modifications can be waived orally, then, it stands to reason that a provision requiring written waiver can be waived orally." Id. Accordingly, irrespective of a clear contractual provision requiring that waivers be made in writing, the court may consider whether Weyerhaeuser waived its contract rights under Section 2.03(a) or acquiesced to Domtar's position through oral statements or conduct.

Weyerhaeuser cites two unavailing cases in support of its position that Delaware law strictly enforces no oral waiver provisions: Phunware, Inc. v. Excelmind Grp. Ltd., 117 F.Supp.3d 613 (D.Del.2015), and Marta v. Mutual Life Insurance Co. of N.Y., 887 F.Supp. 722, 727 (D.Del.1995). In Phunware, the Delaware District Court found that "[a] waiver would only be effective if made in writing." 117 F.Supp.3d at 626. The court, however, was not construing the same contract provision at issue here.7 Marta is equally unavailing, because it involved the application of the statute of frauds to an oral modification of a contract for the sale of land. 887 F.Supp. at 726. Accordingly, the court will defer to the approach taken by the Delaware courts construing the same contract language at issue here. See, e.g., Eureka, 899 A.2d at 108 (stating that parties could orally waive a contract provision stating that "this Agreement may not be amended or supplemented, and no provisions hereof may be modified or waived, except by an instrument in writing signed by each of the Members").

Finally, Weyerhaeuser correctly notes that "Delaware is a pro-contractarian state." (D.I. 67 at 3) In Eureka, Chief Justice Strine noted the cognitive dissonance between this fundamental principal of Delaware law and allowing no oral waiver provisions to be waived orally. 899 A.2d at 109. He found, however, that any concerns with undermining the reliability of written contracts was mitigated by the fact that Delaware law raises the level of proof for oral waiver "from mere preponderance to clear and convincing evidence." Id.

C. Waiver and Acquiescence

The parties agree on the elements of waiver but dispute the elements of acquiescence. (D.I. 67 at 9-11) Accordingly, the court will set forth the elements of waiver and resolve the parties' dispute regarding the elements of acquiescence. Next, Weyerhaeuser argues that no acquiescence or waiver occurred, because: (1) Weyerhaeuser misinterpreted the contract when it agreed to Domtar's position; and (2) the November 26 letter includes the label "without prejudice." (D.I. 67 at 3-4, 6-7, 8-9) Those arguments are insufficient to prevent a waiver or acquiescence defense for the reasons explained below. Thus, the court will identify the statements and conduct demonstrating waiver and acquiescence. Finally, the court will address whether any waiver was retracted.

1. The elements of waiver and acquiescence

Delaware law defines the elements of waiver and acquiescence as applied in this case. See Liggon-Redding v. Estate of Sugarman, 659 F.3d 258 (3d Cir.2011) ("A federal court sitting in diversity must apply state substantive law...."). Under Delaware law, "[w]aiver is the voluntary and intentional relinquishment of a known right." AeroGlobal Capital Mgmt., LLC v. Cirrus Indus., Inc., 871 A.2d 428, 444 (Del.2005) (quoting Realty Growth Investors v. Council of Unit Owners, 453 A.2d 450, 456 (Del.1982)). A party claiming waiver must show that: (1) there is a requirement or condition to be waived; (2) the waiving party knows of the requirement or condition; and (3) the waiving party intended to waive that requirement or condition. Id. Waiver must be proven with "clear and convincing evidence." Eureka, 899 A.2d at 109; see also AeroGlobal, 871 A.2d at 444 ("The facts relied upon to prove waiver must be unequivocal."). "The question of waiver is normally a jury question, unless the facts are undisputed and give rise to only one reasonable inference." Mergenthaler v. Hollingsworth Oil Co. Inc., 1995 WL 108883, at *2 (Del.Super. Feb. 22, 1995).

Acquiescence occurs where a plaintiff "has full knowledge of his rights and the material facts and (1) remains inactive for a considerable time; or (2) freely does what amounts to recognition of the complained of act; or (3) acts in a manner inconsistent with the subsequent repudiation, which leads the other party to believe the act has been approved." Klaassen v. Allegro Dev., 106 A.3d 1035, 1047 (Del.2014) (quoting Cantor, 724 A.2d at 582). "For the defense of acquiescence to apply, conscious intent to approve the act is not required, nor is a change of position or resulting prejudice." Klaassen, 106 A.3d at 1047.

Despite the clear pronouncements of the Delaware Supreme Court in Klaassen, Weyerhaeuser argues that acquiescence requires both intent and detrimental reliance. (D.I. 67 at 9-11) The court is not convinced. Weyerhaeuser is correct that, in Julin v. Julin, the Delaware Supreme Court stated that acquiescence depends "on an evaluation of the knowledge, intention and motivation of the acquiescing party." 787 A.2d 82, 84 (Del.2001). But this statement in Julin appears to be an aberration arising in the context of a family law dispute, without citation to any precedent, and inconsistent with other Delaware cases. Moreover, Julin came out several years before Klaassen.

In the other case cited by Weyerhaeuser, Lehman Brothers Holdings Inc. v. Spanish Broadcasting System, Inc., Vice Chancellor Glasscock stated that a defendant will prevail on an acquiescence defense only if she shows, among other factors, that she "relied to her detriment on the plaintiff's silence." 2014 WL 718430, at *9 (Del.Ch. Feb. 25, 2014). Lehman Brothers, however, was issued one month before Klaassen. Vice Chancellor Glasscock later acknowledged that the Supreme Court's decision in Klaassen "appears to have rendered some of these factors [set forth in Lehman Brothers] superfluous to an acquiescence analysis." Brevan Howard Credit Catalyst Master Fund Ltd. v. Spanish Broad. Sys., Inc., 2015 WL 2400712, at *3 n. 7 (Del.Ch. May 19, 2015). Accordingly, the court will not consider Weyerhaeuser's intent or Domtar's detrimental reliance in connection with the acquiescence defense.

2. Effect of contract misinterpretation

Weyerhaeuser argues that it neither waived its contract rights nor acquiesced to Domtar's position regarding Retired Employees' workers compensation claims, because it made a mistake interpreting the contract. (D.I. 67 at 10; D.I. 51 at 12) Delaware courts, however, have found that a party waived a contract right even though they were mistaken as to the operation of the contract, because they were aware of the potential for mistake.

In Julian v. Eastern States Construction Service, Inc., three brothers were shareholders, officers, and directors in three closely held corporations named ESCS, ESDC, and Benchmark. 2008 WL 2673300, at *1 (Del.Ch. July 8, 2008). As the court construed the relevant agreement, Benchmark had the immediate right to force the brother Gene to sell his stock back to the company when he stopped working for Benchmark sometime in 2003. Id. at *11. Benchmark, however, did not demand a resale of stock until December 2005, when Gene purported to retire from ESCS and ESDC. Id. Gene argued that the delay in enforcing the buyback provision resulted in waiver. Id. at *14. The court agreed. Id. at *17.

The evidence showed that as of April 2003, "Benchmark knew of, and intentionally chose not to enforce" the buyback provision. Id. at *16. It acted on the "mistaken" belief that as long as Gene was employed by at least one of the three businesses, he could retain his stock in all the entities, and would only be required to sell his Benchmark stock back when he stopped working for all three companies. Id. at *15. But Benchmark was also aware of an "arguable basis" for insisting on the immediate buyback of Gene's Benchmark stock at the time he left that company. Id. at *16-17. Because Benchmark failed to enforce that claimed right "in a timely fashion," it waived the right to enforce the buyback provision at all. Id. at *17.

In Pepsi-Cola Bottling Co. of Asbury Park v. Pepsico, Inc., plaintiffs had long term contracts with defendant, called appointments, to purchase concentrate, the syrup used to make Pepsi. 282 A.2d 643, 644 (Del.Ch.1971). The appointments had price provisions that prohibited increases to the price of concentrate unless the changes were due to increases in the cost of "materials, ingredients, crowns and labels." 297 A.2d 28, 30 (Del.1972). Defendant made several changes over the years to the price of its concentrate that were not in conformity with terms of the contract, and plaintiffs never objected until it filed the lawsuit. Id. at 31.

The trial court found that not only did plaintiffs pay invoices based on prices at odds with the terms of the contract, but defendant's notices regarding the price changes "clearly put the plaintiffs on notice that they were no longer doing business with defendant" in conformity with the contract terms. 282 A.2d at 649-50. Having conformed to defendant's notices rather than standing firm on their appointments, plaintiffs effectively waived their rights under the original appointments. Id. at 650. Although the trial court ruled on the basis of waiver, the Supreme Court found that "the acceptance by the plaintiffs of the periodic price changes made by [defendant] was evidence of acquiescence." 297 A.2d at 33. Accordingly, the Supreme Court affirmed the trial court's ruling on the basis of acquiescence. Id. at 32-33.

Weyerhaeuser essentially argues that it must know that Domtar's interpretation is incorrect before it can be found to knowingly and intentionally waive its contract rights. (D.I. 67 at 5-7; D.I. 51 at 13). It makes the same argument with respect to acquiescence. (D.I. 67 at 10) But what Julian and Pepsico demonstrate is that Weyerhaeuser did not have to know for certain that Domtar's interpretation was incorrect before it could waive its contract rights or acquiesce to Domtar's incorrect interpretation. Rather, it is sufficient that Weyerhaeuser knew that there was an "arguable basis" that Domtar's interpretation was incorrect and yet proceeded to accept Domtar's interpretation anyway.8

The case of Textron, Inc. v. Acument Global Technologies, Inc. demonstrates the type of "mistake" regarding the operation of a contract provision that would give the court pause in finding waiver. 2011 WL 1326842 (Del.Super. Apr. 6, 2011). Plaintiff Textron sold a business segment, later renamed Acument, to a private equity firm. Id. at *1. After closing, Acument repeatedly reimbursed Textron, or allowed Textron to withhold, portions of indemnity payments for loses within the United States based on a hypothetical tax benefit. Id. at *3. Acument had always believed that it must be entitled to an actual tax benefit before Textron was entitled to an offset. Id. at *4. Acument had "the mistaken impression that it had a right to deduct the losses on its [United States] tax returns." Id. When Acument learned it was wrong, it began to object to Textron's offset. Id. at *5. The court found that, under those circumstances, Acument had always acted consistent with its interpretation of agreements. Id. at *6. Thus, the court was not prepared to find that Acument had waived its contract rights. Id. Here, Weyerhaeuser has not pointed to any similar mistake that led it to take actions that appeared consistent with Domtar's position, but were actually consistent with its own position. Instead, Weyerhaeuser has merely stated that its earlier conduct was due to an "interpretive mistake." (D.I. 67 at 4)

3. Effect of "without prejudice" label

Weyerhaeuser argues that Giardini's November 26 letter was "for negotiation purposes only" and that "the recipient could not rely on the letter unless it was later confirmed by a formal written agreement." (D.I. 51 at 14) The letter itself contains neither of those caveats, but Weyerhaeuser contends that such limitations should be inferred from the legend "without prejudice" on the first page of the letter.

The phrase "without prejudice" is not commonly used by U.S. lawyers, but is sometimes used by Canadian lawyers to designate a position as non-binding and privileged against use in litigation. Domtar provided several Canadian authorities holding that a "without prejudice" label is not strictly enforced, but instead must be evaluated in light of the communication's purpose and context. See Gaglardi v. Gaglardi, 1992 CarswellBC 709, para. 16 & 20 (Can. B.C.S.C.) (D.I. 57, Ex. 35) (allowing plaintiff to rely on defendant's letter marked "without prejudice" because tone of letter indicates acceptance on part of defendant that plaintiff has a valid claim); Leonardis v. Leonardis, (2003) 50 Alta. L.R. 4th 56, para. 3 (Can. Alta. Q.B.) (D.I. 57, Ex. 36) (explaining that communications marked without prejudice "may be used to prove the fact of and contents of a contract"); see also Adam Dedek, "Solicitor-Client Privilege in Canada," at 10 (February 2011) (D.I. 57, Ex. 38) (explaining that the label "Without Prejudice" is often overused by lawyers and in and of itself does not guarantee that the correspondence cannot be relied upon). It appears that Delaware courts have similarly not taken a bright-line approach with respect to boilerplate labels. See Balin v. Amerimar Realty Co., 1995 WL 170421, at *9 (Del.Ch. Apr. 10, 1995) (explaining that the court will not blindly adopt a party's "strictly confidential" label without considering the documents' contents).

The November 26 letter sets forth several positions with respect to then-unresolved issues that could properly be subject to a "without prejudice" disclaimer. But the statements with respect to workers compensation liabilities were not a mere negotiation proposal. Instead, Giardini was confirming that all the proper authorities within Weyerhaeuser had signed-off on her preliminary agreement in Montreal to Domtar's position. Weyerhaeuser claims that Giardini "did not intend letters marked `Without Prejudice' to be letters Domtar could or would rely on to Weyerhaeuser's detriment." (D.I. 67 at 6) But Weyerhaeuser has not provided any case law supporting the proposition that a writer's subjective intent determines the enforceability of the disclaimer. Accordingly, the court has no legal basis to hold that a single, boilerplate disclaimer on Giardini's November 26 letter is sufficient, by itself, to outweigh Weyerhaeuser's multitude of oral and written statements and years of conduct consistent with Domtar's interpretation of Section 2.03(a).

4. Weyerhaeuser demonstrated waiver and acquiescence

There is no doubt that, at the time Weyerhaeuser first demonstrated waiver or acquiescence in 2008, it had full knowledge of its contractual right under Section 2.03(a) to impose liability on Domtar for Retired Employees' workers compensation claims. As Weyerhaeuser itself admits, in June 2007, its general counsel responded to Domtar's objections by "identif[ying] the contract provisions that assigned liability to Domtar, and outlin[ing] the same contract analysis later applied by the Court" in its July 30, 2014 opinion finding Domtar responsible for Retired Employees' workers compensation claims. (D.I. 51 at 4) Weyerhaeuser also admits that in the September 2008 Montreal meeting, "Domtar took the position it unsuccessfully advanced in this litigation-that the Sale contracts made it responsible only for Transferred Employees." (D.I. 51 at 5) Thus, Weyerhaeuser knew not only the relevant contract provisions, but an "arguable basis" for insisting on its interpretation of Section 2.03(a). As a result, Weyerhaeuser's temporary misinterpretation of the contract does not prevent waiver or acquiescence.

Over the course of several years, Weyerhaeuser's legal, finance, and human resources departments engaged in a continuous, conscious, and voluntary course of action consistent with Domtar's interpretation of Section 2.03(a) and inconsistent with its own rights. In September 2008, authorized representatives of Weyerhaeuser orally expressed agreement with Domtar's position at a meeting in Montreal, but indicated that others within Weyerhaeuser would also have to sign-off before it was official. (D.I. 56 at 6) Giardini then confirmed in a November 26 letter to Domtar that everyone within Weyerhaeuser who needed to sign off on the decision was in agreement that "US workers compensation liability went to Domtar only for employees who became able to work in some capacity at Domtar [i.e., Transferred Employees]." (D.I. 56 at 7) Weyerhaeuser formally revised its accounting records to reflect a decrease in the workers compensation liability it claimed from Domtar. (D.I. 74 at 3-4) Weyerhaeuser also revised, processed, and paid invoices consistent with Domtar's position. (D.I. 56 at 13) A list of issues for resolution prepared in June 2009 by Giardini did not include workers compensation claims because, as Giardini explained at the time, "all past workers compensation invoices have been reconciled." (D.I. 56 at 8) This course of conduct between the parties — the material facts of which are undisputed — demonstrates that Weyerhaeuser knowingly and intentionally waived its right to reimbursement from Domtar for Retired Employees' workers compensation claims or acquiesced to not enforcing that right.

Finally, Weyerhaeuser relies on case law addressing the statute of limitations to claim that each individual workers compensation claim paid pursuant to Section 2.03(a) is subject to its own separate waiver analysis, such that the company may have waived its right to seek reimbursement for some claims made in the past, but not other claims it may make in the future. (D.I. 51 at 15 (citing Price v. Wilmington Trust Co., 1995 WL 317017 at *2 (Del.Ch. May 19, 1995)). Weyerhaeuser, however, has provided no case law supporting its proposition that Delaware law would graft this concept from its statute of limitations analysis onto the doctrine of waiver. Regardless, even within the statute of limitations analysis, performance under a contract "is generally considered a natural consequence flowing from the original decision" to enter into the contract, and not a wrong that can be segmented. Teachers' Ref. Sys. of La. v. Aidinoff, 900 A.2d 654, 665 (Del.Ch.2006); In re Coca-Cola Enter., Inc., 2007 WL 3122370, at *5 (Del.Ch. Oct. 17, 2007) (holding that plaintiff's cause of action accrued at the time the corporation entered into a contract 20 years prior, not at the time of each individual act performed pursuant to rights under the contract); Hawkins v. MedApproach Holdings, Inc., 2014 WL 3926811, at *5 (S.D.N.Y. Aug. 11, 2014) (holding that performance under a Delaware contract, including receipt of fees, is a "natural consequence" of the execution of the documents). Thus, the court finds no reason to slice the waiver analysis as finely as Weyerhaeuser seeks.

5. Retracting waiver

Weyerhaeuser argues that, in January 2012, it retracted any waiver of Section 2.03(a). (D.I. 51 at 15; D.I. 67 at 7-8) Weyerhaeuser provides no authority addressing whether acquiescence can ever be retracted, and the court is not aware of any. Thus, the court's ruling based on acquiescence would still stand even if Weyerhaeuser effectively retracted its waiver. Nevertheless, the court will explain why no retraction occurred here.

A "waiving party may retract [a] waiver by giving reasonable notice to the non-waiving party before that party has suffered prejudice or materially changed his position." Amirsaleh v. Bd. of Trade of N.Y., Inc., 27 A.3d 522, 530 (Del. 2011). The court is most concerned with the fact that Weyerhaeuser has waited over three years to retract its waiver, when it knew or should have known by 2008 all materials facts necessary to discover its interpretative mistake.9 It is well established under Delaware law that a party cannot rescind a contract if they unreasonably delayed. Gotham Partners, L.P. v. Hallwood Realty Partners, L.P., 817 A.2d 160, 174 (Del.2002) (holding that rescission was not available where a plaintiff had "substantially and unjustifiably delayed" in waiting two years before seeking rescission); Sunrise Ventures, LLC v. Rehoboth Canal Ventures, LLC, 2010 WL 363845, at *7 (Del.Ch. Jan. 27, 2010) (explaining that "the party seeking rescission must move with alacrity"); Gaffin v. Teledyne, Inc., 1990 WL 195914, at *18 (Del.Ch. Dec. 4, 1990) ("It is a well-established principle of equity that a plaintiff waives the right to rescission by excessive delay in seeking it."). If unjustifiable delay prevents rescission of a contract, then it stands to reason that unjustifiable delay would prevent rescission of a waiver of a contract.

Although not explicit, Delaware courts have considered delay in determining whether a waiver was rescinded. See Roam-Tel Partners v. AT & T Mobility Wireless Operations Holdings Inc., 2010 WL 5276991, at *12 (Del.Ch. Dec. 17, 2010) (holding that a stockholder rescinded its waiver of appraisal rights when it "promptly" returned the merger consideration); Textron, Inc. v. Acument Global Tech., Inc., 2014 WL 2903060, at *18 n. 232 (Del.Super. Mar. 25, 2014) (finding Acument did not waive its contractual rights despite making payments for a year contrary to those rights, because Acument did not delay in discovering its mistake and notified Textron promptly once the mistake was discovered). Accordingly, the court finds that no waiver was retracted because Weyerhaeuser unjustifiably delayed in giving reasonable notice to Domtar.

V. CONCLUSION

For the foregoing reasons, Weyerhaeuser's motion for summary judgment (D.I. 50) is denied, and Domtar's motion for summary judgment (D.I. 55) is granted.10 An appropriate order shall issue.