都已經是舊聞了, 吃系統資源的怪獸, 免費試用
Download or Order Virtual Server 2005 R2 Enterprise Edition for Free (http://www.microsoft.com/windowsserversystem/virtualserver/default.mspx)
Microsoft VirtualServer之王者歸來(上)　[服務器軟件] (http://big5.pconline.com.cn/b5/www.pconline.com.cn/pcedu/soft/lan/fwqrj/0404/357426.html)
Microsoft to Make Virtual Server Free (http://www.eweek.com/article2/0,1895,1945069,00.asp)

Virtual Server 2005 常見問題集 (http://www.microsoft.com/taiwan/windowsserversystem/virtualserver/evaluation/virtualizationfaq.mspx)
Virtual Server 2005 系統管理員指南 (http://www.microsoft.com/taiwan/technet/prodtechnol/virtualserver/2005/proddocs/default.mspx)
Virtual Server 部署手冊 (http://www.microsoft.com/taiwan/technet/prodtechnol/virtualserver/2005/proddocs/vs_deploy.mspx)

補充: (2006-09-21)
免費的 VMware Player 和 VMware Server (http://www.pczone.com.tw/vbb3/showthread.php?t=121918)

Easily Test Drive and Evaluate Microsoft Products with Virtual Hard Disk (VHD) » My Digital Life (http://www.mydigitallife.info/2007/03/18/easily-test-drive-and-evaluate-microsoft-products-with-virtual-hard-disk-vhd/)
Currently the following Microsoft server products are available in VHD format:

Windows Server 2003 R2 VHD
Exchange Server 2007 VHD
ISA Server 2006 VHD
SQL Server 2005 VHD

Download the VHDs from VHD Download Center (http://www.microsoft.com/downloads/results.aspx?pocId=&freetext=msvhds&DisplayLang=en).
註: 目前可找到10 個以上的VHD

Download Microsoft Virtual Server 2005 R2 SP1 (English) (http://technet.microsoft.com/zh-tw/bb738033(en-us).aspx)
Download details: Virtual PC 2007 (http://www.microsoft.com/downloads/details.aspx?FamilyId=04D26402-3199-48A3-AFA2-2DC0B40A73B6&displaylang=en)

Virtual Server 2005 R2其實還蠻好用的，而且又安全，一般不熟的人會以為這只是一台空電腦，呵～