I saw the attached post earlier in the week.  I was having the same problem so I tried the solution mentioned here.  I was able to set up my existing pst file as the default to which e-mail is delivered, etc.  However when I tried to close the two (2) existing personal folders it gives me the error:
   
"The operation failed.  An object could not be found."
   
It won't delete either of the other personal folders.

By the way, the version of Office I have is Office 2003 for Students and Teachers.  The old (existing) pst file is from Office XP for Students and Teachers.
   
Anybody have any experience?  Please help.
   
Thanks,
   
Mark
         
         ----- Russ Valentine [MVP-Outlook] wrote: -----
         
         Right. That was option two.
         --
         Russ Valentine
         [MVP-Outlook]
         "Christine" <anonymous@discussions.microsoft.com> wrote in message
         news:B7FD7140-EF05-4188-9989-D7BE0C3C109A@microsoft.com...
         > Russ:
         >> I was able to find another way to fix the problem of the multiple
         "Personal Folders"--I just created a new Mail Profile in the Control Panel,
         which created a fresh, new PST file. I then started Outlook with the new
         profile, opened the data file with my old folders, copied items into the
         Personal Folders in my new profile, then closed the old data file.
         Everything works perfectly now!
         >> Thanks, again.
         >> Christine