SCHENECTADY, N.Y.

Aug 31, 2005

Authentidate Holding Corp. (Nasdaq: ADAT) announced today that it will report financial results for its fourth quarter and fiscal year end for the period ended June 30, 2005 on Wednesday, September 7, 2005 after the close of the regular trading session.

The Company stated that management would hold a conference call with investors at 4:30 p.m. EST on Wednesday, September 7, 2005. The dial-in number for the call is 800-811-8824, access code 2455942. The dial-in number for international callers is 913-981-4903, access code 2455942. A replay of the call will be available for five business days upon the completion of the call and will be accessible by dialing 719-457-0820, access code 2455942. The call will also be web cast live, as well as archived, on the Company's website at www.Authentidatehc.com. To access the web cast, click on the "Investor" link on the site, then click on the "Audio Archives" link, then on the link for the call.

The Company also announced that it would present at the Roth Capital Partners Conference in New York, NY on September 8, 2005. The Company presentation is scheduled for 11 a.m. ET and will also be web cast via the Company's web site. To listen to and view the presentation, go to www.Authentidatehc.com, click on the "Investor" link, then the "Audio Archives" link, then on the link for the presentation.

About Authentidate Holding Corp.

Authentidate Holding Corp. (AHC) is the holding company which operates its software and services businesses in three segments: the Security Software Solutions Segment (fka Authentidate Segment, including Authentidate, Inc., Trac Medical Solutions, Inc. and Authentidate International AG), the Document Management Solutions Segment (fka Docstar Division) and the Systems Integration Segment (fka DJS). The Company is a worldwide provider of secure enterprise workflow management solutions that incorporate its proprietary and patent pending content authentication technology. Authentidate's offerings include the United States Postal Service(R) Electronic Postmark(R) Service (USPS(R) EPM(R)), electronic signing solutions, and electronic forms processing solutions. Authentidate also provides secure document management solutions, and enterprise network security products and services.

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, 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.

SOURCE: Authentidate Holding Corp.