Configuration Manager 2007 SP2, R2 and R3 supports Windows 7 SP1 and Windows Server 2008 R2 SP1: System Center Configuration Manager 2007 SP2, R2 and R3 now supports the Windows 7 SP1 and Windows Server 2008 R2 SP1 operating systems for client installation
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Read the complete post at http://scug.be/blogs/sccm/archive/2011/03/29/configmgr-windows-7-sp1-and-windows-server-2008-r2-sp1-now-supported.aspx