Exhibit 99.1

FOR IMMEDIATE RELEASE

Nasdaq Informs Allscripts of Change in Anticipated Date on which Allscripts Common Stock will Trade Without the Right to the Special Cash Dividend

CHICAGO – October 9, 2008 – Allscripts Healthcare Solutions, Inc. (“Allscripts”) (NASDAQ: MDRX), the leading provider of clinical software, connectivity and information solutions that physicians use to improve healthcare, announced that The Nasdaq OMX Group, Inc (“Nasdaq”) informed Allscripts today of a change in the anticipated date on which shares of its common stock will trade without the right to receive the previously announced special cash dividend contemplated by the merger agreement entered into by Allscripts on March 17, 2008. The date on which Allscripts common stock will trade without the right to the special cash dividend is now expected to be October 13, 2008. As previously announced, the record date for the special cash dividend contemplated by the merger agreement with Misys plc is October 9, 2008. Holders of Allscripts common stock who sell their shares through October 10, 2008 also will be selling their right to receive the special cash dividend.

Subject to satisfaction of all other closing conditions, Allscripts expects the transactions with Misys plc to be completed on or about October 10, 2008. The payment of the special cash dividend, which is expected to occur on October 17, 2008, is contingent upon the closing of the transactions contemplated by the Merger Agreement.

About Allscripts

Allscripts (Nasdaq: MDRX) is the leading provider of clinical software, connectivity and information solutions that physicians use to improve healthcare. The company’s unique solutions inform, connect and transform healthcare, delivering improved care at lower cost. More than 40,000 physicians and thousands of other healthcare professionals in clinics, hospitals and extended care facilities nationwide utilize Allscripts to automate everyday tasks such as writing prescriptions, documenting patient care, managing billing and scheduling, and safely discharging patients, as well as to connect with key information and stakeholders in the healthcare system. To learn more, visit Allscripts at www.allscripts.com.

Forward-Looking Statements

This communication contains forward-looking statements. Those forward-looking statements include all statements other than those made solely with respect to historical fact. Forward-looking statements may be identified by words such as “believes”, “expects”, “anticipates”, “estimates”, “projects”, “intends”, “should”, “seeks”, “future”, continue”, or the negative of such terms, or other comparable terminology. In addition, statements made in this communication about anticipated financial results, future operational improvements and results or conditions and approvals are also forward-looking statements. Such forward-looking statements are subject to numerous risks, uncertainties, assumptions and other factors that are difficult to predict and that could cause actual results to vary materially from those expressed in or indicated by them. Such factors may include, but are not limited to: (1) the occurrence of any event, development, change or other circumstances that could give rise to the termination of the merger agreement; (2) the outcome of any legal proceedings that have been or may be instituted against Allscripts, Misys or MHS and others; (3) the inability to complete the proposed transaction due to the failure of any party to satisfy other conditions to completion of the proposed transaction; (4) risks that the proposed transaction disrupts current plans and operations and potential difficulties in employee retention as a result of the merger; (5) the ability to recognize the benefits of the merger; (6) legislative, regulatory and economic developments; and (7) other factors described in filings with the Securities and Exchange Commission. Many of the factors that will determine the outcome of

the subject matter of this communication are beyond Allscripts’ ability to control or predict. Allscripts can give no assurance that any of the transactions related to the merger will be completed or that the conditions to the transactions will be satisfied. Allscripts undertakes no obligation to revise or update any forward-looking statement, or to make any other forward-looking statements, whether as a result of new information, future events or otherwise. Allscripts is not responsible for updating the information contained in this communication beyond the published date, or for changes made to this communication by wire services or Internet service providers.