Some serious help required!


I've been using a pst file to save all my e-mail on a USB drive. It was set up via the Data Management option under "file" and has worked for months. I've been able to turn off my computer, reboot etc and the file ha always been there.
However, I've no transferred to a different job and the guy taking over from me needs access to the pst. We've tried Data Management again to add it to his mailbox, we've tried Import and Export too. The file adds but it seems to have lost the last 6 months of filing! This problem happened a few weeks ago too but the "missing" data reappeared again (no idea what we did to get it back!).
I'm completely lost and feeling rather sick in the middle of a job handover! The only thing I can equate it to is "save a 4 page Word doc one day only to open it the next and find there's a page missing", if that makes sense!!
Any top tips gratefully received!!!