I have also experienced this issue: " I opened Outlook 2003 this morning and received an error message that the set of folders could not be expanded. So I closed the .pst file and then tried to reopen it. I then received an error that outlook did not recognize the file type. I then went to where the file is located and to my the suprise the file size is now 0Kb. I last successfully opend it on Thursday last week and it was working fine. I imagine it was aproaching 2Gb. Any chance this can be repaired? Any suggestions would be appreciated." I have tried scanpst.exe without success, it does not recognize the pst file when I select it. I have tried some recovery s/w for deleted/corrupted files on the hard-drive without success...at a loss on this, any help would be appreciated.