I am used to move all email from server to local PC, so actually only several newest emails would be left on sever.

I met a crash on outlook yesterday afternoon. When re-open, it showed database error and need re-build. But datatbase utility failed at pass 4 of 5.

After some research on internet, I created a new indetity and copied message source&message fold from main identity to the new identity.  Outlook opened successfully then, but losted all email from Jul.5 to Jul 17. 

I tried to link the email in other identity message source folder to the new identity, but still can't find them.

what should I do then?

Any suggestion and help are appreciated!