Pre-configured VHD's available
Just came across this in Download Center: pre-configured VHD images allowing you to quickly evaluate/demo/test Windows Server 2003 R2, Exchange Server 2007, Live Communications Server 2005, ISA Server 2006 and SQL Server 2005.
Get them here:
These are all evaluation versions that will expire in 30 days. Full catalog is available here: https://www.microsoft.com/technet/try/vhd/default.mspx
You need Virtual Server 2005 R2 to test these. Get it here