Forest/Functional Levels

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I could do with some1 clearing this up for me as i have read conflicting articles on this. Scenario is as follows:

forest root: example.com (All DC's running windows 2003)
child domain1: child1.example.com (All DC's running windows 2000)
child domain2: child2.example.com (All DC's running windows 2000)

Forest Functional Level: Windows 2000
Domain Functional Levels: Windows 2000 Native

What i am looking to do is to be able to rename all the DC's in the entire domain. If i am correct then this means that all the domains must be set to 2003 functional level?
My question is as follows: Since all my domain functional levels are at 2000 native, can i raise them to 2003 by simply raising the forest functional level to 2003?
Some articles seem to suggest that i must raise the functional level of the child domains and raise the forest functional level! My understanding is that this is not necessary??

 

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In order to raise the Forest functional level would all of your DC's in the sub domains not need to be at least Windows 2003 first?

 

Damn it, thats where iv gone wrong, ur quite right!! If all my DC's were running 2003 then i could simply raise the domain levels from native to 2003 by raising the forest functional level to 2003. Think iv been studyn 2 much and now missing out obvious points. Time for a break i think!!
Thanks simon

 

http://support.microsoft.com/kb/322692
http://www.petri.co.il/raise_forest_function_level_in_windows_2003.htm