Chapter 5. Migrating to Windows SBS 2011
For users of previous versions of Windows SBS, Windows SBS 2011 is not a simple upgrade. Microsoft does not provide an in-place upgrade path from Windows SBS 2003 R2 or Windows SBS 2008 to Windows SBS 2011 for several reasons, including these:
Hardware requirements Windows SBS 2003 R2 runs on a computer with a 32-bit processor and a maximum of 4 GB of memory. The Microsoft Exchange Server 2003 SP2 product is also a 32-bit application. Windows SBS 2008 and Windows SBS 2011 both require a 64-bit processor and a minimum of 4 GB and 8 GB of memory, respectively. All versions of Exchange since Exchange Server 2007 are also 64-bit applications. ...
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