Outlook.pst won't compact

[gcooper]

When I try to compact my outlook file (after emptying my Deleted Items folder), it doesn't appear to do anything and the file size doesn't change. When I do the same on my other machine, a little progress bar is displayed while it compacts and the file reduces in size. (Outlook is set to Internet Only, not Corporate or Workgroup).

Any ideas what the problem is with the one that won't compact?

Thanks,

Gary Cooper