Authentidate Holding Corp. ("AHC") (Nasdaq: ADAT) today announced that it will have a conference call on Tuesday, August 6, 2002 to discuss recent Company developments.

To participate please dial (800) 633-8410 about 5-10 minutes prior to 11:30 am EDT on Tuesday August 6, 2002. The conference call will also be available on replay starting at 1:30 pm EDT on August 6, 2002, and ending at 1:30 pm EDT on August 7, 2002. For the replay, please dial (800) 633-8284 (confirmation # 20810854). The access number for the replay for international callers is (402) 977-9140 (confirmation #20810854).

About Authentidate Holding Corp.
Authentidate Holding Corp. (AHC) is the holding company of five business units; DocStar, Authentidate International AG, Authentidate, Inc., DJS Marketing Group/Computer Professionals International and Trac Medical Solutions, Inc. DocStar sells a complete line of proprietary document imaging products. Authentidate and Authentidate AG provide the authentication of digital data through its proprietary and patent pending technology. Authentidate intends to establish itself as the authority on "content security" as it is a growing sector of the electronic network security infrastructure market. DJS delivers professional services centered around technology systems integration projects, staff augmentation, outtasking, outsourcing services and resells computer related products. Trac Medical uses the Authentidate service in the medical supply business.