If for some reason your “Right Click” is not working on Outlook, you might be having a corrupted cache specifically the “Frmcache.dat” . If that is the case you need to locate the cache and delete it and log off or restart the computer
Location of the cache:
The Frmcache.dat is Located in C:\Documents and Settings\<username>\Application Data\Microsoft\Forms\
Delete or rename it and log off or restart your computer