Have you ever tried to find the current Schema Version of your Active Directory or Exchange. There is a very easy solution. I came across this article on Microsoft support written by Yuval Sinay MVP.
http://support.microsoft.com/kb/556086/en-us?spid=3198
Active Directory Schema commutability:
13 -> Windows 2000 Server
30 -> Windows Server 2003 RTM, Windows 2003 With Service Pack 1, Windows 2003 With Service Pack 2
31 -> Windows Server 2003 R2
44 -> Windows Server 2008 RTM
Exchange Schema commutability:
4397 -> Exchange Server 2000 RTM
4406 -> Exchange Server 2000 With Service Pack 3
6870 -> Exchange Server 2003 RTM
6936 -> Exchange Server 2003 With Service Pack 3
10628 -> Exchange Server 2007
11116 -> Exchange 2007 With Service Pack 1
Scribblings of a TechnoBuff 
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I was also looking for the schema, still no luck.
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What’s up, this weekend is good designed for me, because this point in time i am reading this enormous informative article here at my residence.