Exhibit 99.1

Entrust Announces Financial Results for First-Quarter 2009

DALLAS — April 28, 2009 — Entrust, Inc. [NASDAQ: ENTU], a world leader in securing digital identities and information, today announced financial results for its fiscal quarter ended March 31, 2009.

Revenues for the first quarter were $22.6 million, a decrease of 12 percent from $25.8 million in Q1 2008. Revenues were impacted by a strong U.S. dollar in Q1 2009. As a result, adjusted for currency, total revenues were $25.3 million, a decrease of 2 percent from Q1 2008. Product revenue decreased to $9.4 million in the quarter, a decrease of 2 percent from $9.6 million in Q1 2008. Product revenues adjusted for currency were $10.6 million, an increase of 10 percent over Q1 2008. The revenue figures, as adjusted for currency, are calculated based upon the actual currency rates in the comparable period.

Deferred revenue increased 2 percent in the quarter to approximately $29.5 million versus Q1 2008. Deferred revenues adjusted for currency were $33.4 million, an increase of 16 percent from Q1 2008 and an increase of 7 percent from Q4 2008. Services accounted for approximately 58 percent ($13.2 million) of total revenue in the quarter, a decrease of 18 percent from $16.2 million in Q1 2008. Declines in professional services revenues and the impact on our Support and Maintenance stream by a strong U.S. dollar accounted for the decrease in overall service and maintenance in the quarter. Services revenues, adjusted for currency, were $14.7 million, a decrease of 9 percent from Q1 2008.

“We are pleased with our financial performance for the quarter,” said Bill Conner, Entrust president and chief executive officer. “Despite a tough economic environment we were able increase our non-GAAP earnings-per-share by three cents and generate positive cash flow from operations of more than $4.4 million (net of change in accrued restructuring charges), which helped us increase our cash balance to $26.6 million.”

Entrust recorded a Q1 2009 net income, calculated in accordance with GAAP, of $1.8 million, or $0.03 per share, compared to Q1 2008 net loss of $1.2 million, or $0.02 per share. On a non-GAAP basis, the company recorded a Q1 2009 non-GAAP income of $2.4 million, or $0.04 per share, compared to Q1 2008 non-GAAP income of $344,000 or $0.01 per share. See the financial table below reconciling these non-GAAP figures to GAAP.

Entrust was also cash-flow-from-operations positive by $4.4 million for Q1 2009, net of change in accrued restructuring charges. Entrust ended the quarter with cash and cash equivalents of more than $26.6 million and no debt.

Because the company has entered into an agreement to be acquired by an affiliate of Thoma Bravo, LLC, the company is not providing guidance for future financial results.

Q1 2009 Financial and Operating Highlights:

Q1 2009 Technology and Industry Highlights:

GAAP to Non GAAP Reconciliation

The following charges for the first quarter of 2009, reconcile the GAAP and non-GAAP earnings per share:

See table below for further details of Entrust’s supplemental reconciliation of GAAP to non-GAAP measures.

Use of Non-GAAP Financial Measures

To supplement the financial results that are prepared and presented in accordance with accounting principles generally accepted in the United States, Entrust’s management prepares and uses non-GAAP financial measures for many of its internal financial, operating and planning reports. The company’s management believes that by

excluding charges such as the purchased intangibles amortization in cost of goods sold, the amortization of purchased intangible assets in operating expenses, stock compensation expense, restructuring charges and write down of strategic investments from its GAAP-based results, these non-GAAP financial measures are more likely to facilitate investors’ understanding of the company’s ongoing business operating results. These non-GAAP financial measures also facilitate comparisons to the operating results of the company’s competitors and provide investors with greater transparency with respect to the supplemental information used by management in its operational and financial decision making.

The non-GAAP measures are included to provide investors with supplemental information to facilitate their understanding of Entrust’s operating results and future prospects. Management uses these non-GAAP measures to assess its success in reducing the company’s cost structure, to measure its ongoing cash operating costs, and to establish budgets and operational goals. The presentation of this additional information should not be considered in isolation or as a substitute for financial and operating results prepared in accordance with accounting principles generally accepted in the United States, as non-GAAP measures are susceptible to varying calculations and they may not be comparable, as presented, to other similarly titled measures of other companies.

This press release contains forward-looking statements relating to the proposed acquisition of the company by an affiliate of Thoma Brovo, LLC. Such statements are based upon preliminary estimates which involve a number of risks and uncertainties. Among the important factors that could cause actual results to differ materially from those indicated by such forward-looking statements are unforeseen operating expenses, inaccuracy in preliminary estimates issues associated with revenue recognition, issues raised in connection with the review of quarterly financial results, currency fluctuations, and the risk factors detailed from time to time in Entrust’s periodic reports and registration statements filed with the Securities and Exchange Commission, including without limitation Entrust’s Annual Report on Form 10-K for the fiscal year ended December 31, 2008. While Entrust may elect to update forward-looking statements in the future, Entrust specifically disclaims any obligation to do so, even if its estimates change.

Important Additional Information Regarding the Proposed Acquisition

In connection with the proposed acquisition of the company by an affiliate of Thoma Bravo, LLC, on April 27, 2009, Entrust filed a preliminary proxy statement with the Securities and Exchange Commission (the “SEC”). Investors and security holders are advised to read the preliminary proxy statement and, when it becomes available, the definitive proxy statement, as well as any other relevant documents filed with the SEC when they become available, because they will contain important information about the proposed acquisition and the parties to the acquisition. Investors and security holders may obtain a free copy of the proxy statement and other documents filed by Entrust at the SEC website at http://www.sec.gov. The proxy statement and other documents filed by Entrust with the SEC also may be obtained for free at Entrust’s Internet website at [www.entrust.com/investors] or by writing to Entrust, Inc., [One Lincoln Centre, 5400 LBJ Freeway, Suite 1340, Dallas, Texas, USA 75240], Attn: [Investor Relations Department]. In connection with the special meeting of Entrust stockholders to approve the merger, Entrust will mail or otherwise provide copies of the definitive proxy statement to Entrust stockholders who are entitled to attend and vote at the special meeting.

The information in the preliminary proxy statement is not complete and may be changed. Before making any voting or investment decisions with respect to the proposed acquisition or any of the other matters with respect to which Entrust’s stockholders will be asked to vote pursuant to the proxy statement, Entrust’s stockholders are urged to read the definitive proxy statement and other documents filed by Entrust when they become available.

About Entrust

Entrust [NASDAQ: ENTU] provides trusted solutions that secure digital identities and information for enterprises and governments in 2,000 organizations spanning 60 countries. Offering trusted security for less, Entrust solutions represent the right balance between affordability, expertise and service. These include SSL, strong authentication, fraud detection, digital certificates and PKI. For information, call 888-690-2424, e-mail entrust@entrust.com or visit www.entrust.com.

Entrust is a registered trademark of Entrust, Inc. in the United States and certain other countries. In Canada, Entrust is a registered trademark of Entrust Limited. All Entrust product names are trademarks of Entrust. All other company and product names are trademarks or registered trademarks of their respective owners.

ENTRUST, INC.

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(in thousands, except per share data)

ENTRUST, INC.

UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS

(in thousands)

The following supplemental tables provide non-GAAP financial measures used by the company’s management to evaluate operational results. The company believes this information may be useful to investors. In addition to disclosing financial results calculated in accordance with U.S. generally accepted accounting principles (GAAP), the company’s earnings release contains non-GAAP financial measures that exclude the income statement effects of share-based compensation, amortization of purchase product rights and other purchased intangibles, write-down of long-term assets and non recurring restructuring and impairment charges, as well as adjusting for currency effects to maintain a constant currency with the prior year’s results. The non-GAAP financial measures disclosed by the company should not be considered a substitute for, or superior to, financial measures calculated in accordance with GAAP, and the financial results calculated in accordance with GAAP and reconciliations to those financial statements should be carefully evaluated. The non-GAAP financial measures used by the company may be calculated differently from, and therefore may not be comparable to, similarly titled measures used by other companies.

Set forth below are reconciliations of the non-GAAP financial measures to the most directly comparable GAAP financial measures.

For additional information regarding these non-GAAP financial measures, see the Form 8-K dated April 28, 2009 that Entrust has filed with the Securities and Exchange Commission.

ENTRUST, INC.

SUPPLEMENTAL

RECONCILIATIONS OF GAAP TO NON-GAAP MEASURES

(in thousands, except per share data)