Installing Exchange 2007 Service pack 2 on a Windows 2008 SBS generates an error, as detailed here:
http://support.microsoft.com/kb/973862.

To resolve, you can either follow the instructions outlined in the KB, or you can download the installation tool, especially designed for SBS 2008.

First, download these: Exchange 2007 SP2 (64-bit edition):
- http://www.microsoft.com/downloads/en/details.aspx?FamilyID=4C4BD2A3-5E50-42B0-8BBB-2CC9AFE3216A Exchange 2007 SP2 installation tool for SBS 2008:
- http://www.microsoft.com/downloads/en/details.aspx?FamilyID=FFD2FE61-927  ...