I was looking for a good reference of AD and Exchange schema version numbers yesterday and thought it would be handy to combine all the bits of information I came across into a single post.

There are a couple of ways to find the schema version number, I prefer using “DSQuery” to “ADSIEdit” so I’ll be making use of “DSQuery” in the following examples.

To determine the version of your AD schema, we use “DSQuery” to find the value of the “objectVersion” attribute:

dsquery * cn=schema,cn=configuration,dc=yourdomain,dc=local -scope base –attr objectVersion

Here is a mapping between the “objectVersion” attribute value and the AD schema version:

To determine the version of your Exchange schema, we use “DSQuery” to find the value of the “rangeUpper” attribute:

dsquery * CN=ms-Exch-Schema-Version-Pt,cn=schema,cn=configuration,dc=yourdomain,dc=local -scope base –attr rangeUpper

Here is a mapping between the “rangeUpper” attribute value and the Exchange schema version:

NOTE: in both examples, it is assumed that your domain name is “youdomain.local”