M$ is flaunting news of a customer migrating from VMware to Hyper-V virtualization on the server. The subject customer is a M$ shop and sees the major reason to switch being cost… If they were not a M$ shop but working for themselves they would see that KVM or VirtualBox would save them more money by far.
M$ charges only about $20 for Hyper-V as long as you pay them $1000+ for 2008 and the damned CALs.
VirtualBox and KVM cost $0 for the server licence and the hypervisor included. Users of GNU/Linux also save a bundle on re-re-reboots that are killing some in large deployments of that other OS.

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I recently contacted a Virtual Academy in my area. These are the specifications of the machines that will be, presumably, loaned to students for use at home:
Speed: 1.8 GHz or better
RAM: 2GB (minimum)
Disk space: 80 GB or more
CD-ROM or DVD drive
Monitor: 15-inch flat panel
Audio: 16-bit sound card
Modem: 56 kbps (minimum)
Microphone and speakers
Operating system: Windows XP SP2 including MS Office 2003
Microsoft® Internet Explorer version 7.0
Adobe® Reader®
Macromedia Flash™
Shockwave™
QuickTime®
McAfee® Virus Protection
Real Player®
Anyone with knowledge and a functioning prefrontal cortex would cringe at the time and effort required to keep these machines working. Not to mention the potential exposure to all the nasties on the Web while using school property. I suspect some proprietary learning software is at the heart of this. That and the inability to look beyond the multicolored flag logo.