We have a non-functional Exchange 2003 installation on our SBS 2003 server that I am trying to uninstall.

So far we have never used, and will never use, Exchange on this server- all we need is to remove it from the system (as it is installed on a partition which we want to merge with the main data partition to increase network storage capacity).

Attempting to remove it using Add/Remove Programs produces the following error:

When doing a search in ADUC to see which users still have a mailbox associated with them, it seems to only be the domain administrator account:

As the Exchange installation is broken, it is not possible to run either System Manager or Exchange 5.5 Administrator to make mailbox changes.

How can I forcibly remove a mailbox (which does not need to be salvaged or backed up), to allow the uninstall of Exchange to proceed?

Any ideas would be appreciated!