- A high number of items (over 5000) in the Inbox, Sent Items, Deleted Items, Calendar and Contacts folder. Note: some users keep years and years of appointments in their calendar.
- Apparently shared calendars can play a role.
- Third-party applications that access the mailbox directly can be the source of the problem.
If you examined the execution of the script in the screenshots above attentively, you may have noticed that it uses the same three-step process we completed earlier, but manually:
- Stop services.
- Delete the search index folder.
- Start services.