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Exchange 2003 Upgrade to Exchange 2010 or Win 2003 DC to Win 2008 R2 DC - which first ?

Hi All,

We have 2 Win 2003 Domain Controllers, the first DC has Exchange 2003 on it.

Just wondering which is better to do first. Upgrade Win 2003 to 2008 R2 first and then do the exchange 2003 to 2010 upgrade ? Have no other exchange Server and don't want to break it!

 Have heard demoting the DC once we have 2008 R2 up can cause problems.

Outlook version is 2003 and we run in cached mode. I am aware of the encryption issue between Outlook 2003 and Exchange 2010. No plans for Outlook 2010 for a few months.

I have a DL380 G6 available for the new DC and will be getting a new Server for Exchange.

Thanks in advance.
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1 Solution
Andy KeeneyCommented:
yes upgrade 2003 to 2008 R2 first.  then the exchange.  and as far as demoting the 2003, all will be fine as long as all roles are transferred from one DC to the other.  also exchange 2010 is x64 only.  so make sure you have the correct equipment and OS's.
boomsongAuthor Commented:
Thanks Andy for the advise.

Anyone else got any take on this?
DC 2003 to 2008 R2 is not really an upgrade, it is just adding the newly configured dl380 G6 as another domain controller..
Make sure to run the adprep/adprep32 /forestprep and /domainprep from the 2008 R2 Cd on the current primary master DC.
Presumably the exchange 2010 will be ending up on the DL380 with the windows 2008 R2?
boomsongAuthor Commented:
Thanks Arnold - yes the DL 380 will be the new DC and I will get another new box for Exchange.

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