exchange 2007 and R2 adprep

This is a follow up to
http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Server/Q_22481680.html

Trying to upgrade from 2003 standart to R2. I have 3 DC.
when insert second R2 CD promted for the key and then getting a pop up saying that I have to first run
adprep from R2 CD on the chema master DC first.
I already have Exchange 2007 installed and ran adprep for it. What happend if I ran adprep from R2 now?
can I get into trouble with it?
leop1212Asked:
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czcdctConnect With a Mentor Commented:
You ran the adprep for Exchange. R2 is asking you to update the forest for the additional AD attributes.
You can run that without any problems.
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SembeeCommented:
Prep for Exchange and prep for Windows 2003 R2 are different things. The fact that you have installed Exchange 2007 has no bearing on prep for R2.

Simon.
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