Upgrade Server 2003 to 2003 R2

Is it possible to upgrade a Server 2003 AD installation with Exchange 2007 to Server 2003 R2?

I know you can upgrade from Server 2003 to R2 with the second disk and run the scripts to upgrade the forest to the newer schema version but was wondering if having Exchange 2007 installed on the box will mess things up.
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Mr KnackeredAsked:
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Seth SimmonsSr. Systems AdministratorCommented:
exchange doesn't support in-place OS upgrades
build a new server and migrate

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rindiCommented:
Why move from one no longer supported OS to another that is also no longer supported? You risk your data to hackers and other exploits, as patches are no longer delivered for those OS's. Particularly as you are connected to the internet that risk is even larger.

Move forward to something that is supported, like 2012r2 server, or if you are on a tight budget, move to Zentyal Server, which includes OpenChange which is an OpenSource exchange-type server. The free version goes without support (except via their forums), while the paid version includes support. It is very easy to setup and maintain:

http://zentyal.org
Mr KnackeredAuthor Commented:
Thanks Rindi but its not down to me but the client. I have already pointed out the risks but they asked the question and I need to give them an answer. I have advised that it is not possible due to Exchange being installed on the machine. I hope they go for an OS upgrade but the choice is theirs.
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Windows Server 2003

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