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upgrade the domain and forest  functional level to 2008 from 2003

Hi all,
We are planning to upgrade the domain and forest  functional level to 2008 from 2003. Please let us know what is the best backup plan and any advise
all domain controller are server 2008 and exchange 2010.
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Hi All,

please advise me for the same
System Administrator
Distinguished Expert 2018
Commented:
Raising your level... There shouldn't be any issues if you don't have an older DC. Just make sure your level is set to the lowest version of your Domain Controller. First, raise the domain functional level, then forest functional level.

If you want detailed steps, please see the official documents...

Raise the Forest Functional Level
https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2008-R2-and-2008/cc730985(v=ws.11)?redirectedfrom=MSDN

Raise the Domain Functional Level
https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2008-R2-and-2008/cc753104(v=ws.11)?redirectedfrom=MSDN
Hello ThereSystem Administrator
Distinguished Expert 2018

Commented:
I am glad I could help you.