I have a client that was an early adopter of Exchange 2007 and the migration went very smoothly. They've been running it for several months now with no problems at all. Today, however, I tried to open the Exchange Management Console and got a MMC dialog box saying "Class not registered". I know that if an error is traced to a specific dll that isn't registered, you can manually register it, but I have no way to determine if the problem is one or several unregistered items. Is there a way to re-register everything associated with Exchange 2007 easily? This is the organization's only Exchange server and I don't want to reinstall unless absolutely necessary. By the way, Exchange still seems to be operating flawlessly - just the interface seems to be botched. I need to make some changes quickly, so time is important.Any assistance would be appreciated.