HII have two domain controllers on the network (PDC and BDC) and both windows 2003 32 bits enterprise servers. I also have exchange server 2003 enterpriseon a separate machine (also windows 2003 32 bits enterprise servers). I am planing to put a new windows 2003 R2 64 bits standard server on the network and I will make it domain controller (BDC at this stage) and later when I have a second 2003 r2 64 bits standarddomain controller (BDC as well) on the network, I will promote first BDC to PDC and retire both windows 2003 32 bits enterprise servers from the network and uninstall ADs from them. I know how to do this all, I will have to extend AD Schema on current Windows 2003 to Windows 2003 R2. I have a lot of document explaining all those steps. One thing that no one has mentioned is existence of exchange 2003 in Windows 2003 r2 AD schema. My question is, when I will extend windows 2003 AD schema to 2003 r2 schema, will I have to do anything to my exchange server or will AD schema changes automatically replicate to my exchange server as well.Please help meThanks

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