Exchange Schema Versions

Below is a list of Exchange versions and related schema versions.

Forest
For the forest, you can find out the current schema version by consulting the rangeUpper property of CN=ms-Exch-Schema-Version-Pt,cn=schema,cn=configuration,<Forest DN>.

To read the forest version, consult the objectVersion property of cn=<ExOrg>,cn=Microsoft Exchange,cn=Services,cn=Configuration,<Forest DN>.

For example, to find out the current Exchange forest schema version, use a tool like ADSIEDIT or dsquery, e.g.

dsquery * CN=ms-Exch-Schema-Version-Pt,cn=schema,cn=configuration,<Forest DN> -scope base –attr rangeUpper

Or use PowerShell:

$RootDSE= ([ADSI]"").distinguishedName
([ADSI]"LDAP://CN=ms-Exch-Schema-Version-Pt,CN=Schema,CN=Configuration,$RootDSE").rangeUpper
([ADSI]"LDAP://cn=<ExhangeOrg>,cn=Microsoft Exchange,cn=Services,cn=Configuration,$RootDSE").objectVersion

Note that the values of these two properties do not always match for matching schema versions. Also, before Exchange 2003 objectVersion didn’t exist so you need to query rangeUpper in that case.

Domain
Besides the forest schema version there’s also a domain schema version (i.e. ForestPrep versus DomainPrep). To find out the schema version of the domain, query the objectVersion property in the Microsoft Exchange System Objects container of the <Domain NC>.

$RootDSE= ([ADSI]"").distinguishedName
([ADSI]"LDAP://CN=Microsoft Exchange System Objects,$RootDSE").objectVersion

Versions

Exchange Forest (rangeUpper) Forest (objectVersion) Domain (objectVersion)
2000 RTM 4397 N/A 4406
2000 SP3 4406 N/A 4406
2003 RTM 6870 6903 6936
2003 SP2 6870 6903 6936
2007 RTM 10637 10666 10628
2007 SP1 11116 11221 11221
2007 SP2 14622 11222 11221
2007 SP3 14625 11222 11221
2010 RTM 14622 12640 12639
2010 SP1 14726 13214 13040
2010 SP2 14732 14247 13040
2010 SP3 14734 14322 13040
2013 RTM 15137 15449 13236
2013 CU1 15254 15614 13236
2013 CU2 15281 15688 13236
2013 CU3 15283 15763 13236
2013 SP1 15292 15844 13236

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