updated the domain functional level of 2003 to exchange 2010 online but not the functional level of the forest. Is it possible now? What issues we face?

I have a domain that was underway at a functional level of 2000 with an Exchange 2003 server.  I had a contractor improved functional level of the domain to 2003 to an exchange server 2010 online to replace the Exchange 2003 server, which he did, but I just discovered that there not upgrading the functional level of the forest.  We have discovered this as it moves to finally remove the Server 2003 out of the environment and visited account the functional level of the forest has been still in 2000.  My question is can we put the 2003 forest functional level, even if the domain is already in 2003 with no impact?  I know that this seems to be a classic case of reading is not things through.  A viable support or feedback would be greatly appreciated.
FYI, first post time!

Hello

The business support, you can find forums on TechNet, please create a new post at the following link:

http://social.technet.Microsoft.com/forums/en/category/WindowsServer/

Tags: Windows

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