Castelle to Exhibit its Network Fax Servers at Microsoft TechEd Europe in Amsterdam, July 5 - 8, 2005.

MORGAN HILL, Calif. -- Castelle (Nasdaq:CSTL), a leader in 'all-in-one' network fax solutions for the business and enterprise markets, today announced that it will participate as an exhibitor at the Microsoft TechEd Europe Conference and Exhibition in Amsterdam, July 5 - 8, 2005.

"Castelle is a Microsoft Certified Partner and, therefore, dedicated to creating fax solutions that are compatible with Microsoft products," said Scott McDonald, President and CEO of Castelle. "At TechEd Europe we will be demonstrating our latest software, FaxPress Premier(TM) 4.0, which has a Look & Feel similar to the Microsoft environment. We released FaxPress Premier 4.0 in the U.S. in June, so this will be the first European debut of the software. We look forward to the opportunity to meet with our partners and customers at the event, as well as meet prospective customers who would benefit from an all-in-one network fax solution."

New FaxPress Premier 4.0 Software

FaxPress Premier 4.0 runs on Castelle's FaxPress Premier Analog and Digital fax servers and includes a new user interface and an enhanced WebClient that offers the same Look & Feel as the feature-rich Windows client. A new Drag & Drop feature allows users to quickly route faxes, move faxes to directories, and organize users into groups; an embedded Xerox Interface provides reliable scan in, fax out integration for Xerox Document Centre and WorkCentre systems. FaxPress Premier 4.0 also includes integration with eCopy ShareScan OP v3.0, which allows users to scan and fax documents directly from a range of copiers, such as Canon, HP, Oce, Ricoh, Sharp, and Toshiba.

Castelle will be among 110 Microsoft partners exhibiting at this year's TechEd Europe. Microsoft TechEd Europe allows attendees to engage in technical sessions, network with peers, and discover and evaluate dozens of the latest Microsoft products, as well as hundreds of products and services offered by Microsoft partners. For more information on Microsoft TechEd Europe 2005, visit the event web site at http://www.mseventseurope.com/teched/05/pre/content/default.aspx.

About Castelle

Castelle, a market leader in 'all-in-one' network fax solutions for business and enterprise, develops office automation systems that allow organizations to easily implement faxing over local area networks and the Internet. Castelle's network fax servers, FaxPress and FaxPress Premier, provide a simple way to integrate fax with email, desktop and back-end applications. Castelle products are designed to be easy to use and maintain, and provide an economical way for companies to share resources over the network. Castelle was founded in 1987 and is headquartered in Morgan Hill, California. Its products are available through a worldwide network of distributors, resellers, and online retailers. Visit Castelle online at www.castelle.com.

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FaxPress(TM) and FaxPress Premier(TM) are trademarks of Castelle. All other trademarks are the property of their respective owners.

Forward-Looking Statements 

This press release may contain forward-looking statements. These statements are subject to risks and uncertainties. Investors are referred to the full discussion of risks and uncertainties associated with forward-looking statements as contained in our reports to the Securities and Exchange Commission, including our Forms 10-Q and 10-K. The Company assumes no obligation to update the forward-looking information.