msmapi32.ocx is a MSMAPI32.OCX
belonging to MSMAPI Controls Library
from Microsoft Corporation
Non-system processes like msmapi32.ocx 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.