VMware is the most-mature solution with the richest management portfolio.
Citrix (acquired XenSource in October 2007) and Virtual Iron have matured, but competition with emerging Xen-based alternatives from Oracle and Sun, as well as Microsoft's Hyper-V, will limit their market potential.
Oracle will be most successful with established, large Oracle customers, specifically with Oracle business applications. Similarly, Sun will be challenged to expand outside the Sun hardware and Solaris base.
Microsoft is late, especially for enterprise use of virtualization, but the midmarket is still a wide-open opportunity. Gartner is concerned that the Hyper-V architecture may cause reliability, vulnerability and maintenance issues because of its dependency on a single copy of Windows Server 2008.
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