Notice that your primary domain field is disabled and you can’t change it? Well, you just bumped into one of the few limitations of a “configuration session” (formerly known as a “ghost” session)
To change the primary domain, close the MDaemon console, open the Windows “Services” management interface (start –> run –> “services.msc”) and stop MDaemon, then launch “MDaemon.exe” from the \MDaemon\App\ directory manually. Note that you must not use the “Start MDaemon” option in the start menu here, that option will restart the service.
Once MDaemon starts, you can change the primary domain, then shut down MDaemon, return to the Windows “Services” management interface and restart MDaemon from there.