Exchange Server 2010 Organization Prerequisites Forest Functional Level 2003

Today I was installing exchange server 2010 and found that the organisation pre-requisites failed with the following message.

Organization Prerequisites

Failed

Error:

The forest functional level of the current Active Directory forest is not Windows Server 2003 native or later. To install Exchange Server 2010, the forest functional level must be at least Windows Server 2003 native.

Now I went in a look at the domain functionality level and found that the domain was already set to Windows server 2003, but what I never realised previously was that the forest functionality level is set separately. Instead of right clicking on the domain and selecting raise functionality level you click on the active directory domains and trusts and select raise functionality level in there.

Once this was completed the installation of the exchange server 2010 was able to proceed without the phone message. Just a little tip for exchange server 2010 installation.

6 thoughts on “Exchange Server 2010 Organization Prerequisites Forest Functional Level 2003

  1. I’ve been encountering this same issue, “The forest functional level of the current Active Directory forest is not Windows Server 2003 native or later. To install Exchange Server 2010, the forest functional level must be at least Windows Server 2003 native.”

    I had changed the domain to be 2003 and above, eliminating 5.5, etc., but I hadn’t changed the forest.

    Once I did, though, I attempted the Exchange 2010 setup and received the same error. I restarted the old server to be safe, but that didn’t solve the problem. Does anyone else remember encountering this or have an idea of where else to look?

  2. Oh, silly me. I went to the Active Directory Domains and Trusts and noticed on the report that it was still saying Windows 2000 for the Forest Level. I raised the forest functional level from 2000 to 2003.

    Now that error message is not showing up anymore.

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