As you may have read in our Exchange Server 2007 and Windows Server 2008 blog post, the RTM version of Exchange 2007 cannot be installed on Windows Server 2008, but Exchange 2007 Service Pack 1 (SP1) will be supported for installation on Windows Server 2008. Here's the tricky part: Exchange 2007 SP1 can be installed on Windows Server 2008, but Windows Server 2008 cannot be installed on Exchange 2007 SP1. This means that all computers running Exchange 2007 SP1 must have Windows Server 2008 already installed before Exchange can be installed on the system. This also means that you cannot take an existing Exchange 2007 server (RTM or SP1) running on Windows Server 2003, and do an in-place upgrade of the operating system to Windows Server 2008. Or can you? I decided to give it a try myself (so you don't have to – please don't try this at home, or at work). I was completely undeterred by the many technical reasons why an in-place upgrade of the operating system cannot be performed on an Exchange server. For example:
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