If you are running into environments and working on aspects of them such as Exchange, OCS, PKI, or other Active Directory integrated applications, you will encounter situations where you may need to update the AD schema. Of course, the first question is, what version am I at today?
Here's a handy way to find out:
Query for the objectVersion attribute of the CN=Schema,CN=Configuration,DC=yourdomainhere of your Active Directory domain and compare the value to the table below.
I've provided links to the schema update information (where available), if you are curious as to what is updated in each.
objectVersion
AD Schema Update13 - Windows 2000 Server
30 - Windows Server 2003 **
44 - Windows Server 2008
** The Windows Server 2003 upgrade from 2000 also adds the CN=Windows2003Update,CN=ForestUpdates,CN=Configuration,DC=yourdomainhere and sets its revision attribute to 9. This hasn't been used again, yet.
Exchange Server saves the current version of its schema updates in an attribute of two locations.
For /forestprep operations, query the rangeUpper attribute of the CN=ms-Exch-Schema-Version-Pt,CN=Schema,CN=Configuration,DC=yourdomainhere object.
For /domainprep operations, query the Microsoft Exchange System Objects object in each domain for its objectVersion value.
The table below provides the number to version translation.
Value
Exchange Version4406 - Exchange 2000 Server
6936 - Exchange Server 2003
10628 - Exchange Server 2007
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