synching of emails for Outlook stops working: sys. reboot re

synching of emails for Outlook stops working: sys. reboot re

error number 70:crmoladdin
While synching email with ZohoCRM online.

All synching stopped working.

Logging out of CRM plugin fails as well.

On restart of Outlook it complained that my personal folder was being used by another application...outlook.pst

The error says that I can't do anything until the other app exits usage of Outlook.
Outlook:
email dead
calendar dead
all folders inaccessible

This is a serious system crash.
In the task manager I don't see any Zoho application running... what is the name of the plugin in the sys tray?

Restarting computer to see if that clears the problem.
dgdlux