Outlook 2011 14.4.1

In the middle of sending an email Outlook crashed.

On re-open it will not allow any action but a Database rebuild.

The rebuilt database has 6 weeks email missing.

Changing back to Back-up Database forces the rebuild selection only.

Another rebuild from the original database has the exact same result - 6 weeks email missing again with the exact same email list. That is all the emails that are lost are lost again to the very last one.

Thus, the problem can be replicated exactly.

Anyone technical will tell you , that if you can't replicate the problem it does not exist. Well, the problem does replicate perfectly and thus can safely assume this is a Microsoft Code problem that needs to be fixed! Now Please Sirs.

This is a business computer so 6 weeks missing email is not an issue its a major f disaster that will result in financial loss!

Please help !

+++ Add 

One wired thing I have discovered may help someone identify the bug.

When I try open the original Database Backup, that forces a Cancel or Rebuild. The 'highlighted blue email" in Outlook I can see in background (with many emails below and above) happens to be the first email in the rebuilt database.  

All email that was above it in the original database is lost. No such thing as a coincidence right?

+++ Add 28th May 2014 8h18 GMT

Even more puzzling.

Created an entire new profile on Mac called Temp User.

Set up Outlook under new profile Temp User.

Fetched email stored on POP servers as far back as I can (4 weeks) (latest default Outlook will allow - bug!)

Exported 640 emails (184 meg) to OLM file.

Close Temp User profile and open old Profile

Import Lost Mail OLM to old Profile Successful

Lost Email folder import will not display emails ???

+++ Add Note

The magic date is 19 April. Anything before this date will not display mail in Inbox nor Sent, nor now in the Imported