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