Exchange Server 2007 SP3 is available for download. This third service pack for Exchange 2007 enables Exchange 2007 to be installed on the Windows Server 2008 R2 version of the operating system. In addition to supporting the Windows Server 2008 R2 server roles, Exchange Server 2007 SP3 also has Windows 7 support for the Exchange management tools.
Clean installations of Exchange 2007 SP3 on a new server are possible by using this download in the same manner as you would install Exchange 2007 RTM, Exchange 2007 SP1 or Exchange 2007 SP2. For an overview of the new features that are available in Exchange Server 2007 SP3, see "What's New in Exchange Server 2007 SP3".
And for those of you evaluating all the Exchange Server 2010, don't miss the beta of Exchange Server 2010 Service Pack 1.
Be aware of some serious issues with Exchange 2007 SP3, e.g. unable to do the Exchange 2010 RTM schema update afterwards.
More information at:
Thanks for the Headsup.