Not the most useful error message that you will ever see. Combine this with a lack of information in the Exchange Setup Log and in the Event Viewer you have a small mystery.
However, the answer is probably really simple: Check you have met the pre-requisites for the setup to run.
- Member of Enterprise Administrators
- Member of Schema Admins
- Member of Exchange Organisation Administrators
And the final check, which allowed setup to run for me. If you have UAC enabled on your server, then right click the setup application, and select Run As Administrator.
Feeling a bit stupid for forgettting about this feature. 2 weeks working on Windows Server 2003 makes you forget that these new-fangled security features exist!
