Active Directory and Exchange Schema Versions, 2010 Update

Its been two years, so it is about time to revisit this post from the past and provide an update to the master table of versions for Exchange and AD schema versions.

If you are dropping 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.

** 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.

Full details on Exchange schema revisions can be found on MSDN.