raising functional level on forest and domain to 2008

I have three domain controllers. Two virtual wineodws server enterprise sp2 64bit and one physical windows server 2008 R2 standard, Then is it safe to raise the Domain and Forest functional level from wineows server 2003 to Windows server 2008
jim3725Asked:
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becraigCommented:
This functional level will only support:
 Windows Server 2012 R2
Windows Server 2012
Windows Server 2008 R2
Windows Server 2008

So be sure you have no OS that are earlier than the above options.

More information at:
http://technet.microsoft.com/en-us/library/understanding-active-directory-functional-levels%28v=ws.10%29.aspx
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jim3725Author Commented:
Please confirm that is only for domain controllers? I have other member servers that are still at 2003.
That's why i am posing the question. Does it only apply to domain controller servers being at 2008 or does it include member servers being at 2003????
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becraigCommented:
Member servers are just members and have no real function in the AD architecture as such you are safe to have them.

However unless there are constraints, I would move towards getting away from OS's that are less if not unsupported.
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