In terms of schema updates does 'Exchange 2007 SP3' adprep /forestprep and 'Server 2008' adprep /forestprep do the same thing?

I'd like to add a 2008r2 DC to an existing 2003-level forest (which requires 2008 adprep on the forest) and I've not yet had the need to apply SP3 to Exchange (which brings 2008 compatibility to Exchange).

Domain functional level will stay at 2003, as all my existing DCs are 2003.

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No, the Exchange ADPREP adds Exchange-specific objects and attributes to the AD schema, while the Windows ADPREP adds... exactly that: Windows-specific ones.

There probably are some schema extensions which are shared between the two ADPREPs, but none of them includes the totality of the other.

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  • so ultimately i will need to do the 2008 adprep, and the exchange one is optional? (considering im not raising domain functional levels) – BoyMars Aug 26 '10 at 10:47
  • You don't need to apply SP3 to your Exchange 2007 servers in this scenario. But you really should, it's not very wise to not install a major unpdate if you don't have any really compelling reason for that (i.e. it breaks something you need). – Massimo Aug 26 '10 at 11:43

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