Vignette (see page 103)

Vignette Corporation

Attn: Corporate Secretary

1301 South MoPac Expressway

Austin, Texas 78746

(512) 741-4300

Vignette provides Web content management, intranet solutions, social media, experience optimization, video, rich media and transactional content management solutions. Vignette’s solutions give organizations the capability to provide a personalized and highly engaging Web experience. In addition to creating high-value interactions through their Web presence, Vignette customers are also able to integrate systems and information from inside and outside the organization; manage the lifecycle of enterprise information; and collaborate by supporting ad-hoc and process-based information sharing.

Together, Vignette’s products and expertise help companies harness the power of their information and the Web to deliver high-value interactions, build communities online and meet users’ demands for any content, at anytime, anywhere, on the device of the user’s choosing.

Vignette was incorporated in Delaware on December 19, 1995. Vignette currently markets its products and services throughout the Americas, Europe, Asia and Australia. Vignette’s common stock is listed and traded on the NASDAQ Global Select Market under the symbol “VIGN.”

Vignette maintains a site on the Internet at www.vignette.com; however, information found on Vignette’s website is not part of this proxy statement/prospectus.

Open Text (see page 97)

Open Text Corporation

275 Frank Tompa Drive

Waterloo, Ontario, Canada N2L0A1

(519) 888-7111

Founded in 1991, Open Text is an independent company that provides enterprise content management, or ECM, software solutions that help in the management of critical business content, including version revisions and compliance with regulatory requirements. Open Text’s primary ECM solution, Livelink, enables corporations to manage traditional forms of content such as images, office documents, graphics and drawings, as well as to manage electronic content, including web pages, email and video. Open Text’s solutions allow users to gain access to view and manage all information related to a transaction or business process, without having to switch applications. Open Text’s common stock is listed and traded on the Toronto Stock Exchange under the symbol “OTC” and the NASDAQ Global Select Market under the symbol “OTEX.” Open Text maintains a site on the Internet at www.opentext.com; however, information found on Open Text’s website is not part of this proxy statement/prospectus.

Scenic Merger Corp. is a direct wholly-owned Subsidiary of Open Text Inc., which in turn is an indirect wholly-owned subsidiary of Open Text.

Vignette will hold a special meeting of its stockholders on                     , 2009, at 9:00 a.m. local time, at the Inter-Continental Stephen F. Austin Hotel, 701 Congress Avenue, Austin, Texas 78701. At the special meeting, you will be asked to vote on a proposal to adopt and approve the merger agreement and the transactions contemplated thereby. You will also be asked to approve the adjournment of the special meeting, if necessary, to solicit additional proxies in favor of the adoption and approval of the merger agreement and the transactions contemplated thereby.

You may vote at the special meeting if you owned shares of Vignette common stock at the close of business on the record date,                     , 2009. On that date, there were              shares of Vignette common stock outstanding and entitled to vote at the special meeting. You may cast one vote for each share of Vignette common stock you owned on the record date.

The proposal to adopt and approve the merger agreement and the transactions contemplated thereby requires the affirmative vote of the holders of a majority of the shares of Vignette common stock outstanding on the record date. A failure to vote your shares or an abstention will have the same effect as a vote against the proposal to adopt and approve the merger agreement and the transactions contemplated thereby.

The proposal to adjourn the special meeting, if necessary, to solicit additional proxies in favor of the adoption and approval of the merger agreement and the transactions contemplated thereby requires the affirmative vote of the holders of a majority of the shares of Vignette common stock

The merger agreement is attached to this document as Appendix A. You should read this agreement carefully, as it is the legal document that governs the merger of Scenic Merger Corp., an indirect wholly-owned subsidiary of Open Text referred to herein as Merger Sub, with and into Vignette, which will result in Vignette being an indirect wholly-owned subsidiary of Open Text.

After careful consideration, on May 5, 2009 the Vignette board of directors unanimously determined that the terms of the merger agreement and the transactions contemplated thereby are advisable and in the best interests of Vignette and its stockholders and adopted and approved the merger agreement and the transactions contemplated thereby. The Vignette board of directors recommends that the stockholders of Vignette vote “FOR” the adoption and approval of the merger agreement and the transactions contemplated thereby and vote “FOR” the adjournment of the special meeting, if necessary, to solicit additional proxies in favor of the adoption and approval of the merger agreement and the transactions contemplated thereby.

In considering the recommendation of the Vignette board of directors with respect to the merger agreement and the transactions contemplated thereby, Vignette stockholders should be aware that some directors and officers of Vignette will receive benefits if the merger is completed that result in those persons having interests in the merger that are different from, or in addition to, the interests of Vignette stockholders.

J.P. Morgan Securities Inc., referred to herein as J.P. Morgan, has acted as exclusive financial advisor to Vignette in connection with the merger. At the May 5, 2009 meeting of the Vignette board of directors, J.P. Morgan delivered its oral opinion, subsequently confirmed in writing as of the same date, to the Vignette board of directors to the effect that, as of the date of such opinion, based upon and subject to the assumptions made, matters considered and limits of the review undertaken by J.P. Morgan, the merger consideration

of $8.00 in cash without interest per share and 0.1447 shares of Open Text common tock per share was fair, from a financial point of view, to the holders of the outstanding shares of Vignette common stock.

The full text of J.P. Morgan’s written opinion, dated May 5, 2009, which sets forth, among other things, the assumptions made, matters considered and limits on the review undertaken by J.P. Morgan, is attached as Appendix C to this proxy statement/prospectus and is incorporated herein by reference. The J.P. Morgan opinion is not a recommendation as to how any holder of shares of Vignette common stock should vote with respect to the merger or any other matter. Vignette stockholders are urged to read the J.P. Morgan opinion in its entirety.

A number of Vignette’s executive officers and directors have interests in the merger that are different from, or in addition to, your interests.

All optionholders, including the directors and officers of Vignette that are optionholders, will be entitled to acceleration of all of their stock options immediately prior to the closing of the merger. The directors of Vignette will also be entitled to acceleration of all of their restricted stock immediately prior to the closing of the merger.

In addition to the foregoing, Vignette officers and directors will also receive indemnification and liability insurance benefits in connection with the merger and certain of Vignette’s officers may be offered employment with Open Text, although no agreements have been entered into and no terms, conditions or understandings have been finalized. Additionally, certain executive officers of Vignette will be entitled to receive additional benefits upon or as a result of the consummation of the merger.

Each Vignette stockholder will generally recognize gain or loss measured by the difference between (i) the amount of cash and fair market value of shares of Open Text stock received, and (ii) such stockholder’s tax basis in Vignette common stock exchanged.

Open Text will account for the merger under the acquisition method of accounting for business combinations.

The merger is subject to antitrust laws. On May 18, 2009, Open Text and Vignette each made the required filings with the Department of Justice and the Federal Trade Commission pursuant to the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, referred to herein as the HSR Act, and requested early termination of the required waiting period. However, Open Text and Vignette are not permitted to complete the merger until the applicable waiting periods under the HSR Act have expired or been terminated. The Department of Justice or the Federal Trade Commission, as well as a state or a private person, may challenge the merger at any time before or after its completion. If antitrust authorities request additional information or challenge the merger on antitrust grounds, such approvals may be delayed or may not be obtained.

In addition, the merger is contingent upon review by the Committee on Foreign Investment in the United States, referred to herein as CFIUS, pursuant to Section 721 of the Defense Production Act of 1950, as amended by the Foreign Investment and National Security Act of 2007, and as implemented by Executive Order 11858, as amended, and 31 C.F.R. Part 800. On May     , 2009, Open Text and Vignette made a joint voluntary filing with CFIUS. The parties are not required to consummate the merger until CFIUS, or the President of the United States, issues a letter indicating that there are no unresolved issues that would affect the national security of the United States. As a condition of receiving such a letter the parties may enter into a mitigation agreement to exclude certain assets from the merger and/or assume certain obligations requested by the government to protect national security. In the absence of receiving such a letter or entering into a mitigation agreement the parties may withdraw the CFIUS Notification and/or the merger may be delayed or blocked.

Under Delaware law, Vignette stockholders may have the right to receive an appraisal of the fair value of their shares of Vignette common stock in connection with the merger. To exercise appraisal rights, a Vignette stockholder must not vote for the proposal to adopt and approve the merger agreement and the transactions contemplated thereby, must deliver to Vignette a written appraisal demand before the stockholder vote on the merger agreement is taken at the special meeting, must not submit a letter of transmittal, and must strictly comply with all of the procedures required by Delaware law.

A copy of Section 262 of the Delaware General Corporation Law, referred to herein as the DGCL, is included as Appendix D to this proxy statement/prospectus.

Upon completion of the merger, each outstanding share of Vignette common stock, excluding any treasury shares and any shares held by Open Text, its subsidiaries, or any dissenting stockholder, will be converted into the right to receive the merger consideration of $8.00 in cash without interest, and 0.1447 shares of Open Text common stock. The total amount of merger consideration you will receive will be the product of the merger consideration per share multiplied by the number of shares of Vignette common stock you hold. No fractional shares of Open Text common stock will be issued in connection with the merger, as discussed below.

Vignette Stock Options

As a result of the merger, all outstanding and unexercised stock options under Vignette’s stock option plans and agreements, including stock options held by executive officers and directors of Vignette, will fully vest and become exercisable immediately prior to the closing of the merger. Persons who exercise their stock options prior to the effective time of the merger will be entitled to receive the merger consideration, just like other Vignette stockholders. If persons holding such stock options choose not to exercise their stock options prior to the effective time of the merger, their stock options shall be cancelled immediately prior to the effective time of the merger and

converted into the right to receive a payment, if any, in cash and/or shares of Open Text common stock. The applicable payment to which each Vignette optionholder will be entitled to receive, if any, is dependent on the per share exercise price of each Vignette stock option, as discussed below.

If the per share exercise price of a Vignette stock option is less than $8.00, the outstanding and unexercised shares of Vignette common stock subject to the stock option will be converted, as of the effective time of the merger, into the right to receive the following: (A) cash consideration equal to the product of (i) $8.00 less the applicable per share exercise price of the Vignette stock option, and (ii) the number of shares subject to the Vignette stock option as of the effective time of the merger; and (B) stock consideration of a number of shares of Open Text common stock equal to the product of (i) 0.1447, and (ii) the number of shares subject to the Vignette stock option as of the effective time of the merger. An amount necessary to satisfy the applicable minimum withholding tax obligation shall first be reduced from the cash consideration to be received pursuant to (A) above and then, if necessary, from the number of shares of Open Text common stock issued pursuant to (B) above. For this purpose, the value of the stock consideration will be based on the most recent closing price of Open Text common stock prior to the date of the closing of the merger.

If the per share exercise price of a Vignette stock option is less than the value of the per share merger consideration (consisting of the cash consideration and the stock consideration) that Vignette stockholders are entitled to receive, but greater than or equal to $8.00, such outstanding and unexercised Vignette stock option will be converted, as of the effective time of the merger, into the right to receive in shares of Open Text common stock, an amount equal to the product of (i) value of the merger consideration less the applicable per share exercise price of the Vignette stock option, and (ii) the number of shares subject to the Vignette stock option as of the effective time of the merger. The number of shares of Open Text common stock to be issued will be reduced in an amount necessary to satisfy the applicable minimum withholding tax obligation. For purposes of calculating the value of the merger consideration and the withholding, the value of the stock consideration will be based on the most recent closing price of Open Text common stock prior to the date of the closing of the merger.

If the per share exercise price of a Vignette stock option is greater than the value of the per share merger consideration, such options will be cancelled at the closing of the merger and the holders of such options will not receive any merger consideration.

Vignette Restricted Stock

As a result of the merger, all outstanding shares of Vignette common stock that, as of immediately prior to effective time of the merger, are unvested or subject to a repurchase option, risk of forfeiture or other condition (e.g., transferability restrictions) under any restricted stock purchase agreement or other agreement or arrangement with Vignette, in each case that survives the consummation of the merger (referred to herein as restricted stock), will be converted automatically at the effective time of the merger

Promptly after the effective time of the merger, Mellon Investor Services, LLC, as the exchange agent for the merger, will establish an exchange fund to hold the merger consideration to be paid to Vignette stockholders in connection with the merger. The exchange agent will mail to each record holder of Vignette common stock a letter of transmittal and instructions for surrendering the record holder’s stock certificates or book-entry shares in exchange for the cash consideration and shares of Open Text common stock. Upon proper surrender of Vignette stock certificates or book-entry shares in accordance with the exchange agent’s instructions, the holder of such Vignette stock certificates or book-entry shares will be entitled to receive book-entry shares representing the number of whole shares of Open Text common stock issuable to such holder pursuant to the merger, the cash portion of the merger consideration issuable to such holder pursuant to the merger and cash in lieu of any fractional share of Open Text common stock issuable to such holder.

No fractional shares of Open Text common stock will be issued in connection with the merger. Instead, each holder of shares of Vignette common stock who would otherwise have been entitled to receive a fraction of a share of Open Text common stock will receive an amount of cash (without interest) determined by multiplying the fractional share interest by the average of the last sale prices of Open Text common stock, as reported on the Nasdaq Global Select Market, for the five trading days immediately preceding the closing, rounded to the nearest whole cent.

The merger agreement contains customary representations and warranties made by Open Text and Merger Sub on the one hand, and Vignette on the other, relating to their respective businesses, as well as other facts pertinent to the merger. These representations and warranties are subject to materiality, knowledge and other similar qualifications in many respects and expire at the effective time of the merger or termination of the merger agreement, as further described below. The representations and warranties of each of Open Text, Merger Sub and Vignette have been made solely for the benefit of the other party and those representations and warranties should not be relied on by any other person. In addition, those representations and warranties may be intended not as statements of actual fact, but rather as a way of allocating risk between the parties, may have been modified by the disclosure schedules attached to the merger agreement, are subject to the materiality standard described in the merger agreement, which may differ from what may be viewed as material by you, will not survive consummation of the merger and cannot be the basis for any claims under the merger agreement by the other party after termination of the merger agreement, and were made only as of the date of the merger agreement or another date as is specified in the merger agreement.

The merger agreement contains provisions prohibiting Vignette from seeking a competing transaction, subject to certain exceptions described below. Under these “no solicitation” provisions, Vignette has agreed that neither it nor its subsidiaries, nor any of its officers and directors or its subsidiaries shall, and that it shall not permit or authorize its representatives to, directly or indirectly:

•     initiate, solicit or knowingly encourage the submission of an acquisition proposal or acquisition transaction;

•     furnish to any person (other than Open Text, Merger Sub or any designees of Open Text or Merger Sub) any materials or information relating to Vignette or any of its subsidiaries, or afford to any person

access to the business, properties, assets, books, records or other materials or information, or to the personnel of Vignette or any of its subsidiaries (other than Open Text, Merger Sub or any designees of Open Text or Merger Sub);

•     participate or engage in discussions or negotiations with one or more persons with respect to an acquisition proposal or an acquisition transaction;

•     approve, endorse or recommend an acquisition proposal;

•     enter into any letter of intent, memorandum of understanding or other contract contemplating an acquisition transaction; or

•     take any other action that would reasonably be expected to lead to any inquiries or the making of an acquisition proposal.

However, prior to the adoption and approval of the merger agreement and the transactions contemplated thereby at the special meeting, Vignette may, after providing written notice to Open Text, furnish information to and enter into discussions or negotiations with any person that enters into an acceptable confidentiality agreement with Vignette and makes an unsolicited bona fide acquisition proposal that the Vignette board of directors in good faith, after consultation with its outside counsel and financial advisor, concludes is likely to lead to, or constitutes, a superior proposal if, and only to the extent that, the Vignette board of directors determines in good faith, after consultation with outside counsel, that failing to take such action would be a breach of its fiduciary duties under applicable law. Vignette has agreed to provide Open Text with notice of any superior proposal it receives.

Open Text may terminate the merger agreement if the Vignette board of directors has withdrawn or modified in a manner adverse to Open Text its approval and recommendation to adopt and approve the merger agreement and the transactions contemplated thereby or if the Vignette board of directors approves or recommends another acquisition proposal. Likewise, Vignette may terminate the merger agreement if Vignette’s board of directors has authorized Vignette to enter into a definitive agreement to effect a superior proposal. If either Open Text or Vignette terminates the merger agreement in connection with these provisions, or in the additional circumstances described in “Terms of the Merger Agreement — Termination of the Merger Agreement and Termination Fee” beginning on page 93, Vignette has agreed to promptly pay Open Text a fee of approximately $10.9 million.

The respective obligations of Open Text and Vignette to complete the merger and the other transactions contemplated by the merger agreement are subject to the satisfaction or waiver of various conditions that include, in addition to other customary closing conditions, the following:

•     the merger agreement must be adopted and approved by the requisite affirmation vote of the holders of outstanding shares of Vignette common stock;

•     the waiting period applicable to the merger under the HSR Act shall have expired or terminated;

•     no governmental authority shall have enacted a law that renders the merger illegal or formally issued an injunction that is in effect and prohibits the merger;

•     the SEC shall have declared the registration statement of which this document is a part effective under the Securities Act and no stop order suspending the effectiveness of the registration agreement or this proxy statement/prospectus shall have been issued and no proceedings for such purpose shall have been initiated or threatened by the SEC and no similar proceeding in respect of this proxy statement/prospectus shall have been initiated or threatened by the SEC;

•     the shares of Open Text common stock to be issued at the effective time of the merger must have been authorized for listing on the Nasdaq Global Select Market and conditionally approved for listing on the Toronto Stock Exchange;

•     any applicable notification from CFIUS that is required or sought by Open Text must have been obtained;

•     the representations and warranties of the other party set forth in the merger agreement must be true and correct, except where a failure to be true and correct would not have a material adverse effect on the party making the representations and warranties; and

•     the other party to the merger agreement must have performed in all material respects all of its obligations, agreements and covenants required by the merger agreement.

The obligations of Open Text and Merger Sub to complete the merger are also subject to various other conditions, including the following conditions:

•     Vignette’s delivery to Open Text of a certificate regarding the performance of Vignette’s obligations;

•     the amendment to the Stockholder Rights Agreement shall be in full force and effect; and

•     there must not have occurred, since the date of the merger agreement, any material adverse effect on Vignette and its subsidiaries that is continuing.

The obligation of Vignette to complete the merger is also subject to the following conditions:

•     Open Text’s and Merger Sub’s delivery to Vignette of a certificate regarding the performance of their obligations; and

•     there must not have occurred, since the date of the merger agreement, any material adverse effect on Open Text and its subsidiaries that is continuing.

Open Text and Vignette cannot be certain when, or if, the conditions to the merger will be satisfied or waived or whether or not the merger will be completed.

The merger agreement may be terminated at any time before the effective time of the merger in the following manner:

•     by mutual written consent;

•     by either Open Text or Vignette, if Vignette’s stockholder approval has not been obtained at the special meeting;

•     by either Open Text or Vignette, if the merger has not been consummated by December 31, 2009;

•     by either Open Text or Vignette if any governmental authority enacts a law that renders the merger illegal or formally issues a permanent, final and non-appealable injunction or order that prohibits the merger;

•     by either Open Text or Vignette, if the other breaches its respective material covenants and such breach is not cured within 30 days;

•     by Open Text, if Vignette’s board of directors makes a change of recommendation with respect to the merger agreement, fails to issue a public statement reaffirming Vignette’s board recommendation of the merger agreement within ten days following the commencement of a tender offer or exchange that constitutes or would constitute an acquisition proposal or ten days following an acquisition proposal becoming public, or if Vignette has intentionally breached its obligations not to solicit an acquisition proposal; or

•     by Vignette, if its board of directors approves Vignette entering into a definitive agreement to effect a superior proposal.

If the merger agreement is terminated under certain circumstances, Vignette will be required to pay Open Text a termination fee equal to approximately $10.9 million.

Additionally, if the merger agreement is terminated under certain circumstances, Vignette will be required to pay Open Text all reasonable out-of-pocket expenses Open Text incurs in connection with the merger agreement and the transactions contemplated thereby, up to a maximum of $2 million.

Voting Agreements (see page

96)

Concurrently with the execution and delivery of the merger agreement, on May 5, 2009, Open Text entered into voting agreements with each of Thomas P. Kelly, Bryce Johnson, Somesh Singh, Gayle Wiley, each of whom is an executive officer of Vignette, and the members of the Vignette board of directors, including Michael A. Aviles, with respect to approximately 555,124 shares of Vignette common stock or approximately     % of the shares of Vignette common stock outstanding on the record date, and stock options to purchase an aggregate of 894,190 shares of common stock of Vignette.

Statement of Income data:

Revenues:

License

Customer support

Service and other

Total revenues

Cost of revenues:

License

Customer support

Service and other

Amortization of acquired technology-based intangible assets

Total cost of revenues

Gross profit

Operating expenses:

Research and development

Sales and marketing

General and administrative

Depreciation

Amortization of acquired customer-based intangible assets

Special charges (recoveries)

Total operating expenses

Income from operations

Other expense, net

Interest expense, net

Income before income taxes

Provision for (recovery of) income taxes

Net income before minority interest

Minority interest

Net income for the period

Net income per share—basic

Net income per share—diluted

Weighted average number of Common Shares outstanding—basic

Weighted average number of Common Shares outstanding—diluted

Balance Sheet Data:

Cash and cash equivalents

Working capital

Total assets

Long term liabilities

Total Shareholders’ equity

Revenue:

Product license

Services

Total revenue

Cost of Revenue

Product license

Amortization of acquired technology

Services

Total cost of revenue

Gross profit

Operating expenses:

Research and development

Sales and Marketing

General and administrative

Purchased in-process research and development, acquisition-related and other charges

Business restructuring (benefit) charges

Amortization of intangible assets

Total operating expenses

Income (loss) from operations

Other income, net

Income (loss) before provision for income taxes

Provision for (benefit from) income taxes

Net income (loss)

Basic net income (loss) per share

Diluted net income (loss) per share

Shares used in computing basic net income (loss) per share

Shares used in computing diluted net income (loss) per share

Balance Sheet Data:

Cash and cash equivalents

Working capital