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Close all Office applications. Then goto Applications > Utilities folder and open Activity Monitor. In Activity Monitor, under Process select the SyncServicesAgent or other apps you want to quit and select Quit or Force Quit
If that didn't work, restart your Mac and without opening any Office applications, quit it with Activity Monitor.
Please let me know if that didn't work, so we can continue troubleshooting. Don't Rate my answer until you are satisfied.
Didn't work. Restarted. Did NOT open any Office application. Could Force Quit in activity monitor for less than a second and by the time I put SyncService in trash -- open again
OK This time it worked. Thanks. What next?
Good. No problems so far.