Exchange 2007 SP3 and 2003 AD Schema

I am running 2003R2 servers and exchange 2007SP1. I am upgrading to 2007 SP3 but part of the upgrade process is to extend the AD schema. Will this work if the domain is still 2003? or are there any pitfalls I need to be aware of?
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Benjamin MOREAUConnect With a Mentor Project ManagerCommented:
AD 2003 / Forest 2003 is supported (https://technet.microsoft.com/en-us/library/ff728623%28v=exchg.150%29.aspx)

But you have to install at least SP1 on your AD 2003 servers.
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dsnegi_25decConnect With a Mentor Commented:
Yes , That it work

Exchange Server 2007 and Windows Server 2003 Operating System/Domain Controller

- Exchange 2007 can be installed on Windows Server 2003 SP2 or Windows Server 2003 R2 SP2.

- Exchange 2007 can work with Windows Server 2003 SP1 and SP2 Domain Controllers.

- Exchange 2007 requires Windows Server 2003 Forest/Domain Functional Level.
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