I have been having trouble with the .pst, particularly when emptying
the recycle bin.

I ran scanpst against the .pst file, and in Phase 1 of 8, an error
message pops up:
"An unexpected error prevented access to the file. Use a disk error
checking program to check the disk, and then try using the Microsoft
Office Outlook 2007 Inbox Repair tool again."

I ran chkdsk in safe mode, but scanpst aborted at the same place.

Thanks for the help.