Bob had 50 folders in his personal.pst; he created folder 51 and the next time he logged on, he had folder 51 and 1400 emails which were in the 50 personal folders, but no personal folders. We have restored his personal.pst from a couple of weeks back and the problem still exists. A technician has logged onto her computer as him and the problem exists. Can anyone tell us what might have happened to the personal folders?