After the un-install was completed and the server rebooted, there were massive .net errors and most of the Exchange services would not start. Microsoft spent 4 hours trying to determine what went wrong. They were stumped and wanted to kick it up to a higher tier, but that would not happen until the following Monday. The business owner did not want to lose that much production time and we restore from the backup made just prior to the un-instalation.
Well, just tried it again. Same results. MMC can't load modules. Most Exchange services will not start.
This attempt was done with all Exchange services turned off.