Do you have any third party tool accessing the pst, eg a Desktop Search
Tool?

And if you start Outlook using the safe switch, then after shutting down,
then running scanpst does it then find errors?

"Surya Halim" wrote in message
news:84E69C5C6161417CB8D0938002605AEF@e65h...
I have used scanpst from time to time to repair my Outlook.pst. I usually
run it a few times on Outlook.pst until it reports that it finds no error.
Then I start up Outlook that reads Outlook.pst and mounts it as my Personal
Folder. Sometime later, I shut down Outlook and out of curiosity, I run
scanpst again on Outlook.pst. This time scanpst again reports that it finds
problems and offers to fix it, I run it a few times on the PST until no
error is found. I start up Outlook again and the cycle repeats. So, Outlook
2007 "corrupts" Outlook.pst every time it is accessing the PST?

Until now, Outlook 2007 has not yet failed to open Outlook.pst for me and I
do back up Outlook.pst regularly but this worries me a little.