No event on calendar
 

I have had multiple calendar events that have been e-mailed to me. When
opening the e-mail, I was notified that the event was moved or deleted.
Contacted other the person in my office that had sent the request for the
meeting and it is showing on their calendar. Restarted my PC and I was able
to accept the event, but still shows that the event was moved or deleted.
Are there any thoughts on what could be causing this issue.