before going on vacation, I performed a full TimeMachine backup on my iMac [running OSX 10.7.5] and then shut down the system

after returning from vacation, I upgraded my Office 2011 from ver 14.3.6 to ver 14.3.7, seemingly without problems, i.e. no errors/warnings

after the DB Utility completed [NO problems were reported during the scan main identity, verify, copy and recover phases] I started Outlook and immediately discovered that I had completely lost the prior 16 month's worth of emails

I shut down my iMac, restarted it with Command-R and performed a full restore from my TimeMachine external backup drive, seemingly successful

after I verified that I was running Office ver. 14.3.6, I started Outlook again

as soon as Outlook ran, it immediately announced that the main Identity was out of date and forced execution of the DB Utility, upon completion of which I discovered again that the latest dated email was May 5th