Microsoft was quick to release this one – you can now try Exchange 2010 SP1 without the trouble of even installing it!

Checkout this pre-canned virtual machine of Exchange 2010 with SP1:

http://www.microsoft.com/downloads/details.aspx?FamilyID=53F7382A-3664-4DE3-8303-31E514D69F02&displaylang=en

You’ll need Hyper-V to use this machine, as Virtual PC doesn’t support x64 guests.