Authentidate Holding Corp. (Nasdaq: ADAT), a worldwide provider of secure enterprise workflow management solutions, today announced it plans to report financial results for the fiscal 2006 fourth quarter and year ended June 30, 2006 on Wednesday, September 13, 2006 after the close of market trading.

Management will host a conference call at 4:30 p.m. ET on Wednesday, September 13, 2006 to discuss the latest corporate developments and results. The dial-in number for callers in the U.S. is 888-424-6580 and the dial in number for international callers is 973-321-1023. The access code for all callers is 7799727.

A replay of the call will be available through September 20, 2006. To access the replay, please dial 877-519-4471 in the U.S. and 973-341-3080 outside the U.S., and then enter the access code 7799727.

A live webcast of the call will be available on the Company's website at http://www.authentidate.com. To access the webcast, click the "About Us" link on the Company's website, followed by "Investor Relations" on the drop-down menu and then the "Audio Archives" link. The webcast will be archived on Authentidate's website following the conclusion of the call.

About Authentidate Holding Corp.

Authentidate Holding Corp. is a worldwide provider of secure enterprise workflow management solutions that incorporate its proprietary and patent- pending content authentication technology. Authentidate also provides secure document management solutions, and enterprise network security products and services.

The company operates its software and services businesses in three segments: the Security Software Solutions segment (including Authentidate, Inc., Trac Medical Solutions, Inc. and Authentidate International AG), the Document Management Solutions segment (Docstar Division) and the Systems Integration segment (DJS). For more information, visit the company's website at http://www.Authentidate.com.

This press release contains forward-looking statements within the meaning of section 27A of the Securities Act of 1933 and section 21E of the Securities Act of 1934. When used in this release, the words "believe," "anticipate," "think," "intend," "plan," "will be," "expect," and similar expressions identify such forward-looking statements. Such statements regarding future events and/or the future financial performance of the Company are subject to certain risks and uncertainties, which could cause actual events or the actual future results of the Company to differ materially from any forward-looking statement. Such risks and uncertainties include, among other things, the availability of any needed financing, the Company's ability to implement its business plan for various applications of its technologies, related decisions by the USPS, the impact of competition, the management of growth, and the other risks and uncertainties that may be detailed from time to time in the Company's reports filed with the Securities and Exchange Commission. In light of the significant risks and uncertainties inherent in the forward-looking statements included herein, the inclusion of such statements should not be regarded as a representation by the Company or any other person that the objectives and plans of the Company will be achieved.