Mainsoft's Visual MainWin Supports Sun Solaris 10 OS

Offering enables ISVs to quickly port Windows applications to x64 architecture

SAN JOSE and SANTA CLARA, Calif. - Feb. 22, 2005 - Mainsoft^® , the cross-platform development company, today announced an agreement with Sun Microsystems, Inc. (Nasdaq: SUNW) that will enable independent software vendors (ISVs) to quickly port C++ applications to the Solaris 10 Operating System (OS). Mainsoft will certify its Visual MainWin product suite to the Solaris 10 OS for the x64 architecture (32-bit and 64-bit). The certified tools will enable industry-leading ISVs to offer enterprise-class applications that take advantage of the security, manageability and performance of Solaris 10.

"Our ISV customers are telling us they want fast, cost-effective tools to deliver their enterprise-class products on Solaris 10 for the x64 platform," said Yaacov Cohen, president and CEO, Mainsoft Corporation. "Extending our alliance with Sun is a milestone in our commitment to enable ISVs to develop enterprise-class applications once, and deploy them natively on the UNIX and Linux platform of choice."

The Visual MainWin product suite enables C++ developers to write enterprise-class applications in the productive Visual Studio^® development environment, and deploy them natively on multiple UNIX^® and Linux platforms. Visual MainWin v. 5 for UNIX and Linux offers enterprise-class performance and scalability, with proven robustness for non-stop operation. It supports 15 Linux and UNIX platforms, including versions of Sun Solaris 8, 9 and 10 for both SPARC^® , AMD Opteron and Intel processor-based architectures.

"Mainsoft's robust Visual MainWin porting platform plays a critical role in speeding independent software vendor's time-to-market while controlling costs," said Stephen Borcich, vice president, Partner and Industry Marketing, Sun Microsystems. "Working with Mainsoft is an integral element to our tools partner strategy, to help application providers bring a broader range of premier apps for Solaris 10 on SPARC, x86 and x64 platforms to market as quickly as possible."

"With the addition of Solaris 10, Mainsoft's Visual MainWin continues to be a key enabler for leading solutions providers such as Siebel Systems to deliver enterprise-class software products across a number of disparate platforms," said Skip Bacon, Vice President, Technology, Siebel Systems. "We rely on Mainsoft to meet Siebel's demanding deployment schedules while significantly lowering our total cost of ownership."

Siebel intends to use Visual MainWin to provide Siebel eBusiness Applications on Solaris 10 in an upcoming release.

Visual MainWin for J2EE, released in February 2004, enables Visual Basic.NET and C# developers to write ASP.NET Web applications and Web services using Visual Studio .NET and deploy them natively on the J2EE platform, including Solaris 10, Weblogic and Websphere.

About Mainsoft Corporation

Founded in 1993, Mainsoft Corporation, the cross-platform development company, enables businesses to develop mission-critical applications with Visual Studio software and deploy them natively on J2EE, UNIX^® and Linux^® platforms, dramatically reducing development costs and time-to-market. The company is a first-mover in cross-platform development. Its world-class research and development team has created patented cross-platform products that solve critical problems facing ISVs and IT organizations. Many of the world's largest ISVs including Siebel, Computer Associates and IBM Rational, use Mainsoft's products to extend the productivity of Microsoft Visual Studio, deploying more than $1 billion worth of software annually on multiple operating systems. For more information, visit www.mainsoft.com.

About Sun Microsystems, Inc.

Since its inception in 1982, a singular vision -- "The Network Is The Computer" -- has propelled Sun Microsystems, Inc. (Nasdaq: SUNW) to its position as a leading provider of industrial-strength hardware, software and services that make the Net work. Sun can be found in more than 100 countries and on the World Wide Web at http://sun.com .

Sun, Sun Microsystems, the Sun logo, Solaris, and The Network Is The Computer are trademarks or registered trademarks of Sun Microsystems, Inc. in the United States and other countries. UNIX is a registered trademark in the United States and other countries, exclusively licensed through X/Open Company, Ltd. All SPARC trademarks are used under license and are trademarks or registered trademarks of SPARC International, Inc. in the United States and other countries. Products bearing SPARC trademarks are based upon an architecture developed by Sun Microsystems, Inc. Visual MainWin is a registered trademark of Mainsoft.

Press Contact :
Jenna Dobkin
Director of Marketing
Mainsoft Corporation
Ph: (408) 200-4024
Fax: (408) 200-4044
jennad@mainsoft.com