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Using adprep commands to upgrade a Windows 2003 domain

I have Windows 2003 R2 server running Exchange 2007 SP1, Blackberry Enterprise Server 4.1.6, the server is also the Domain Controller (I know this is not a supported configuration but it has worked flawlessly over 2 years).

Want to add a Windows server 2008 R2 DC to the domain as a backup DC (i'll also move Exchange and BES to its own box in the future). I know I must run "adprep /forestprep" and "adprep /domainprep" to upgrade the 2003 domain, but I'd like to know whether this upgrade may cause a problem with Exchange and BES. Should I merely run "adprep" on the DC or need to do something else to prepare Exchange or BES for this upgrade?
Active DirectoryWindows Server 2003Exchange

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Lee W, MVP

8/22/2022 - Mon
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Lee W, MVP

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