AuthentiDate Digital Signature Solution for Electronic Billing Implemented by T-Mobile.

Business Editors

DUSSELDORF, Germany--(BUSINESS WIRE)--Jan. 29, 2003

AuthentiDate International AG, a wholly-owned subsidiary of AuthentiDate Holding Corp. (NASDAQ: ADAT), announced that T-Mobile, one of the leading international mobile phone networks and a subsidiary of Deutsche Telekom (NYSE: DT), implemented a solution for its electronic, signature-based invoicing business using AuthentiDate's digital signature solution.

Using the AuthentiDate technology, outgoing electronic invoices issued by T-Mobile Germany are provided with qualified, electronic signatures in accordance with the German Digital Signature Act and European Signature Directives. For the first time, this will enable customers to use signed, electronic invoices for prepaid value added tax deduction purposes, without the need to retain additional paper copies of the invoices.

The use of electronic signatures in electronic invoicing processes has been required under German sales tax law ever since January 1, 2002, and is now an obligatory step for any invoice recipient who wishes to utilize prepaid value added tax deduction without having to receive and keep paper invoices.

The AuthentiDate eBilling signature solution enables invoice issuers and invoice recipients to tap into some real opportunities for significant savings. As well as completely removing the need for the cost-intensive process of sending out paper invoices, it also allows those invoice recipients, who do not have Electronic Data Interchange (EDI) systems, to receive invoices electronically, without requiring them to process paper copies of the invoices. These electronic invoices can be made available for automatic data importing, without the need for any additional manual input and, at the same time, they represent an authorized, officially recognized basis for prepaid value added tax deduction.

The AuthentiDate solution also actively permits the simultaneous signing of invoices in a variety of formats. This allows for the signed transmission of invoices in multiple formats: for example, as a standard PDF file to be viewed by staff, and, simultaneously, as a data record to be processed in the system.

"T-Mobile, one of the largest international mobile phone networks, is now providing its broad customer base with a revolutionary opportunity to significantly optimize their processes for dealing with incoming invoices," explains Jan C. Wendenburg, Chief Executive Officer of AuthentiDate International AG.

About AuthentiDate International AG

AuthentiDate International AG (www.authentidate.de), Dusseldorf, Germany is the first Accredited Certification Provider, certified by the German Regulatory Authority for Telecommunications and Posts (RegTP), focusing legal binding timestamps compliant to the strong German electronic signature laws and European signature directives. Thus, the time signatures supplied by AuthentiDate International AG for any electronic data provide the highest level of protection recognized by law in the form of qualified digital signatures.

AuthentiDate is also the first accredited vendor focusing business process solutions, based on electronic signatures and time stamping technology. AuthentiDate's Business Solutions feature short ROI (return of invest) cycles, simple integration, low operating expense and ease of use. The unique design enables most customers for the first time receiving substantial profit contributions from signature and time stamping technologies.

The AuthentiDate Group has a worldwide presence; in Europe, the USA and through partners in Asia. AuthentiDate Holding Corp, Inc. located in the USA (New York) is listed on the NASDAQ stock exchange (ADAT) and in Germany (WKN 893715).

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. AuthentiDate and AuthentiDate AG provide the authentication of digital data through its proprietary and patent pending technology. AuthentiDate is establishing itself as the authority on "content security," a growing sector of the electronic network security infrastructure market Trac Medical uses the AuthentiDate service to improve speed, accuracy and security in processing medical forms. These three business units comprise the AuthentiDate Segment for financial reporting purposes. DocSTAR sells a complete line of document imaging products and DJS delivers professional services centered on systems integration projects, staff augmentation, out-tasking and outsourcing services, and resells computer related products.

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.