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This was all valuable information and correct as I've just launched the install. Thanks to you all.
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I'm flattening a workstation that came pre-loaded with Win x64 &nbsp;and loading Server 2008 R2 x64. There is a recovery partition[System] and an OS partition [primary]. Will the installation of the Server to the Primary partition automatically update the System partition? If not, is it preferable to delete them both, and recreate the Primary. I'm pretty sure in one of these scenarios, the Recovery partition is created by the setup routine.
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I'm flattening a workstation that came pre-loaded with Win x64  and loading Server 2008 R2 x64. There is a recovery partition[System] and an OS partition [primary]. Will the installation of the Server to the Primary partition automatically update the System partition? If not, is it preferable to delete them both, and recreate the Primary. I'm pretty sure in one of these scenarios, the Recovery partition is created by the setup routine.

Server 2008 R2 Setup Recovery Partition

The Microsoft Server topic includes all of the legacy versions of the operating system, including the Windows NT 3.1, NT 3.5, NT 4.0 and Windows 2000 and Windows Home Server versions.

Microsoft Server OS

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.

Windows Server 2008

The Microsoft Legacy Operating System topic includes legacy versions of Microsoft operating systems prior to Windows 2000: All versions of MS-DOS and other versions developed for specific manufacturers and Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions, and Windows Mobile.