Windows 2003 Standart license swap with windows 2003 R2

We do have two 2003 standard SP1 domain controllers and few member server. Two of my member servers do have 2003 R2 installed. Ideally I 'would like to switch licenses so that my DC will have R2 and members will be downgraded to standard 2003. Is it possible to do without getting into a lot of aggregation?
The reason is that I’d like to use R2 functionality on Domain controllers while I don’t have any use for R2 additional functionality on my member servers.
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OEM licenses are bound to the hardware they are installed. If you have OEM is not possible, you will need to purchase new licenses for the DC's.

Agreed with above, if these are preinstalled then your not going to get too far, however, you could always promote your R2 servers to DC's and the demote your DC's to servers......


leop1212Author Commented:
Acctually I do have 5 open license 2003 R2,
how can I upgrade current DC from 2003 to R2 without reinstalling anything?
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Just install the Second CD, it will ask you for the R2 CD-Key.
R2 = enhancements to Server 2003 SP2.
It shouldn't cause any problems, but always backup first!!!

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leop1212Author Commented:
Thanks you,
I've installed second CD to my third (spare)  domain controller with no roles and  Pop Up says that I  have to first run adprep on the schema nad opertraion master.
I do have exchange 2007 installed please advise if there could be any conflicts or complications from adprep step?
thank you
In theory it shouldn't

You might want to wait for more input from others such as Jay Jay.
Ask an admin to reopen this question because we are not done yet!
have you run the adprep tools from the second CD?
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