Outllook XP stops responding

[Mark B]

I have just installed office XP onto a machine.
All apps seem fine but every so often Outlook stops responding and takes up
all of the CPU power. Sometimes after five mins it continues on as if nothing
had happened. Other times I have to close Outlook down and restart it. Which
of course starts the recovery process for the .pst files.

We are running IMAP e-mail accounts.
I have ran scanpst on all .pst files.

Any hints would be appreciated.