PST-file location in Outlook 2003

We are using Outlook 2003 as a mail client for our IMAP
server. We also using Roaming Profiles so that our users
can log on from several computers.

Do anybody know how to change the location of the PST-
file which automatically will be located in the user
profile under the local settings. We want to locate the
PST-file in the users homefolder instead of to write back
the local settings of the user profile everytime a user
logs off.

In earlier version of Outlook these settings could be
changed in the registry HKEY_USERS\S-1-
....\Software\Microsoft\Windows NT\CurrentVersion\Windows
Messaging Subsystem\Profiles\...

Thanx
/Michael