Exchange Server Object version / Schema version
To install any exchange server you need to upgrade the Active directory Schema. The administrator should verify it before stepping further. Following is the schema version of Active Directory . you need to verify it from ADSIEDIT tool. Exchange Version Forest rangeUpper attribute Forest objectVersion Domain objectVersion Exchange 2000 SP3 4406 - 4406 Exchange 2003 RTM 6870 6903 6936 Exchange 2003 SP1 6870 6903 6936 Exchange 2003 SP2 6870 6903 6936 Exchange 2007 RTM 10637 10666 10628 Exchange 2007 SP1 11116 11221 11221 Exchange 2007 SP2 14622 11222 11221 Exchange 2007 SP3 14625 11222 11221 Exchange 2010 RTM 14622 12640 12639 Exchange 2010 SP1 14726 13214 13040 Exchange 2010 SP2 14732 14247 13040 Exchange 2010 SP3 14734