Hays AG Integrates Authentidate® Signature Solution for Electronic Invoicing
Authentidate's compliant solution enhances invoice portal and improves customer service

DÜSSELDORF, Germany
January 08, 2008

Hays AG, the German subsidiary of Hays plc., one of the world's leading specialist recruitment companies, announced today that it has implemented electronic invoicing to optimize processes and improve customer service.

Hays stated that it chose an electronic signature solution from Authentidate Deutschland GmbH, a subsidiary of Authentidate International AG, an electronic signature specialist. Authentidate's legally compliant signature solution was seamlessly integrated into Hays' infrastructure in order to provide an electronic solution for incoming invoices from the Company's business partners.

Hays' business partners, such as freelancers who are placed with different clients by recruiters, can now create their invoices to Hays using the portal by applying an electronic signature as required by law. This solution allows Hays to receive invoices electronically, eliminating the need for paper, thereby cutting costs. Invoices can be deducted from input tax due to the signature functionality integrated by Authentidate. Hays is also considering a signature solution for outgoing invoices to customers.

The Authentidate signature solution has been tested and implemented by a variety of international companies, and has proven to be a highly flexible solution to integrate. Hays also uses the Authentidate Signature Check Server to verify signatures as required by law, resulting in a fully electronic purchasing invoice process.

The solution will be presented at the Enterprise-Signature-Day
Feb. 21, 2008 - Duesseldorf, Germany
For registration: http://www.enterprise-signature-day.com/

About Hays AG
Hays AG is the leading company for recruitment specialists in the Germany-Austria-Switzerland region and has placed highly qualified IT, engineer, finance, pharmaceutical and legal experts in projects and positions at over 500 companies. Hays' continuously expanding resource pool currently includes around 75,000 specialists for freelance projects, temporary positions, and permanent positions. Over 3,000 Hays specialists are currently placed with companies. Hays AG is part of the British Hays plc group, the world's leading recruitment specialist with over 370 offices in 25 countries and a turnover of €3.1 billion (fiscal 2006/2007).

About Authentidate International AG
Authentidate International AG develops and provides independent business-process solutions enabling customers to simply and quickly integrate digital signatures and time stamps into existing corporate processes. The unique set of solutions can be used for almost any business process (i.e. billing, workflow, archiving, scanning and e-mail communication) to significantly reduce costs and optimize processing immediately. Authentidate International AG is a subsidiary of Authentidate Holding Corp.

About Authentidate Holding Corp.
Authentidate Holding Corp. (Nasdaq: ADAT) 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.