Microsoft and XenSource to Develop Interoperability for Windows Server 'Longhorn' Virtualization

Collaboration Will Enable Customers to Virtualize Xen-Enabled Linux on

Windows Server

Jul 18, 2006, 01:00 ET from Microsoft Corp.

    REDMOND, Wash. and PALO ALTO, Calif., July 18 /PRNewswire-FirstCall/ --
 Microsoft Corp. (Nasdaq:   MSFT) and XenSource Inc. today announced they will
 cooperate on the development of technology to provide interoperability
 between Xen(TM)-enabled Linux and the new Microsoft(R) Windows(R)
 hypervisor technology-based Windows Server(R) virtualization. With the
 resulting technology, the next version of Windows Server, code-named
 "Longhorn," will provide customers with a flexible and powerful
 virtualization solution across their hardware infrastructure and operating
 system environments for cost-saving consolidation of Windows, Linux and
 Xen-enabled Linux distributions.
     (Logo: )
     "Microsoft's commitment to customers is to build bridges across the
 industry with solutions that are interoperable by design," said Bob Muglia,
 senior vice president of the Server and Tools Business at Microsoft. "Our
 work with XenSource, a recognized leader in open source virtualization
 technology, reflects that commitment and Microsoft's ongoing efforts to
 bring virtualization solutions to the mainstream and help customers
 progress toward self-managing dynamic systems."
     "We are pleased to collaborate with Microsoft as a development partner
 and to deliver interoperable virtualization solutions," said Peter Levine,
 president and CEO of XenSource. "Xen-enabled guests will run seamlessly on
 XenEnterprise now, and, as a result of this agreement, Xen-enabled Linux
 guests will also run on Windows Server virtualization. XenSource will also
 deliver additional products based on the collaboratively developed
 technology, further expanding the value of the relationship."
     Benefits for Customers
     The joint efforts between the two companies will deliver the following
 customer benefits:
     -- Interoperability by design through collaborative development of two
        leaders in virtualization technology
     -- A flexible, high-performance and more reliable virtualization solution
        with Windows Server "Longhorn," optimized to support heterogeneous
        software environments and a wide array of hardware
     -- Microsoft technical support for issues regarding interoperability with
        Xen-enabled Linux guest operating systems through the standard
        Microsoft technical support process
     Microsoft anticipates providing a beta release of Windows Server
 virtualization by the end of 2006 and plans to release the solution to
 manufacturing (RTM) within 180 days of the RTM of Windows Server
 "Longhorn," which is targeted for the end of 2007. Microsoft currently
 provides virtual machine add-ins and technical support for Linux guest
 operating systems running on Virtual Server 2005 R2.
     This agreement builds on an ongoing relationship between Microsoft and
 XenSource. XenSource has previously licensed the Microsoft Virtual Hard
 Disk format to enable interoperability with Microsoft virtualization
 technologies. For customers with Premier-level support agreements,
 Microsoft will use commercially reasonable efforts to address potential
 issues with Microsoft software running in XenEnterprise.
     About XenSource
     XenSource, Inc. develops the leading enterprise grade platform
 virtualization solution, XenEnterprise(TM), based on the industry's
 highest-performance virtualization technology, the open source Xen(TM)
 hypervisor. Founded and run by the Xen development team, XenSource products
 allow enterprises to realize the TCO savings that result from server
 consolidation, increased utilization, and reduced complexity in the
 datacenter. XenEnterprise will be generally available as a packaged and
 commercially licensed product in Q3 2006. For more information, visit .
     About Microsoft
     Founded in 1975, Microsoft is the worldwide leader in software,
 services and solutions that help people and businesses realize their full
     NOTE: Microsoft, Windows and Windows Server are either registered
 trademarks or trademarks of Microsoft Corp. in the United States and/or
 other countries.
     XenSource, Xen and XenEnterprise are trademarks of XenSource, Inc.

SOURCE Microsoft Corp.