More than 500 participants at Europe's largest congress and trade exhibition for electronic signatures

DÜSSELDORF, Germany
February 26, 2008

Electronic signatures have finally come out of their niche existence. Signature solutions are being used increasingly as a standard instrument for process optimization. This trend became apparent at Europe's largest signature conference last Thursday in Düsseldorf.

The organizer, Authentidate International AG, welcomed more than 500 participants there for the third time in succession.

Company representatives from every sector kept themselves up-to-date during the conference lectures and at the accompanying industrial exhibition. As in previous years, the character of the conference was very practice-oriented. Users of a vast number of well-known corporate groups described graphically how they had implemented signature solutions in their own companies.

In this connection, it became clear that the use of signatures for optimizing processes and cutting costs is an absolute necessity for medium-sized companies and corporate groups in particular. According to statements of the experts, the use of signatures is increasing constantly even in international business transactions. In the estimation of current users, companies that want to gain competitive advantages by means of faster processes and to reduce error sources by means of fully automatic processing can no longer ignore the issue of the electronic signature.

At the same time, the distribution of signatures on the market is accelerating due to an ever increasing number of standard preinstalled signature products, e.g. in archive, workflow and DMS systems.

In the field of invoice exchange, connectors are also facilitating the integration of signatures into the process e.g. for ERP systems and service providers. In this way, it can also be converted gradually to electronic invoice exchange.

In live demonstrations, almost 30 national and international providers presented the use of electronic signatures in business processes during the conference breaks. The demonstrations ranged from the signature of invoices e.g. directly from SAP, right up to the legally binding long-term archiving of electronic approval procedures.

In a special eHealth forum, established solutions were presented, such as signatures in mass-document recording and similarly innovative topics as well as the electronic health insurance card and use of signatures in conjunction with EPR (Electronic Patient Records).

More information about the signature solutions featured, an overview of all exhibitors and experts as well as numerous photos can be found at http://www.enterprise-signature-day.de

About Authentidate Germany
Authentidate, Duesseldorf, Germany, develops and provides vendor independent business-process solutions enabling for the first time anyone to integrate simply and quickly digital signatures and time stamps into existing corporate processing. The unique set of solutions, which can be used for almost any corporate process, i.e. billing, workflow, archiving, scanning and e-mail communication, will help to reduce costs significantly and optimize processing immediately.

Many high profile companies in various industries and governmental organizations using Authentidate digital signature solutions for years in Germany, Europe and other countries to substitute paper processing through legally binding, electronic business processes in accordance with international and local legal environments.

For the first time professional signature solutions are available either as boxed products, web services or individual solutions, based upon a common flexible and modular architecture. The elements of the unique offering, available from Authentidate Deutschland GmbH, may be used independently or in combination with other solutions. Today, many software vendors already have integrated Authentidate's signature products into their standard offerings. Therefore any organization now may easily benefit from automatic digital signatures processing.

In addition, Authentidate International AG offers governmentally certified trust center services in accordance with the German Signature Act and the EU Signature Directive. Authentidate International AG was accredited by the German Federal Network Agency (Regulatory Agency for Telecommunications and Postal Affairs) in November of 2001 and operates a trust center especially for time stamp services.

Authentidate is headquartered in the USA and is today the sole supplier of the United States Postal Service® Electronic Postmark® (USPS® EPM®), a unique service for secure electronic communication in the USA. Authentidate Holding Corp. is listed on the (Nasdaq: ADAT) and at German stock markets (Security Identification Code 893715).

About Authentidate Holding Corp.
Authentidate Holding Corp. is a worldwide provider of secure workflow management software and web-based services.  The company's automated and trusted workflow solutions enable enterprises and office professionals to employ rules-based electronic forms, intelligent routing and transaction management, electronic signing, content authentication, identity credentialing and verification and web and fax based communication capabilities.  Customer benefits from the company's offerings include reduced costs, improved productivity and service levels, automated audit trails, enhanced compliance with regulatory requirements and the reduction of paper-based processes.  The company has offices in the United States and Germany. In the United States we offer our patent pending content authentication technology in the form of the United States Postal Service® Electronic Postmark® (EPM).

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.

Authentidate is a registered trademark of Authentidate Holding Corp.  Inscrybe and MyInscrybe are trademarks of Authentidate Holding Corp.  All other trade names are the property of their respective owners.