Haven't tried it myself and don't know much about it.
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Experience Server Virtualization -- Free!
Begin enjoying the benefits of server virtualization with the free VMware Server. VMware Server installs on any existing server hardware and partitions a physical server into multiple virtual machines by abstracting processor, memory, storage and networking resources, giving you greater hardware utilization and flexibility. Streamline software development and testing and simplify server provisioning as you utilize the ability to "build once, deploy many times."
Read the data sheet for more information or download the free VMware Server and try it for yourself.
Discover the power of software virtualization and how it can help your business. Save time and money as Virtual PC allows you to maintain the compatibility of legacy and custom applications during migration to new operating systems and increases the efficiency of support, development, and training staffs.
Whether Microsoft virtualization technology is an important component of your existing infrastructure or you're just a Virtual PC enthusiast, you can now download Virtual PC 2004 Service Pack 1 absolutely free. Microsoft is also offering the free download of Virtual PC 2007, with support for Windows Vista in 2007.