mnmsrvc.exe is a process belonging to Microsoft NetMeeting, more specifically to the Remote Desktop Sharing service. "This program is a non-essential system process, but should not be terminated unless suspected to be causing problems. "
Non-system processes like mnmsrvc.exe originate from software you installed on your system. Since most applications store data in your system's registry, it is likely that your registry has suffered fragmentation and accumulated invalid entries which can affect your PC's performance. It is recommended that you check your registry to identify slowdown issues