Make Outlook XP Contacts default as OAB

I have a customer using Outlook XP in a CItrix Environment. Due to space
limitations, they delete all users Citrix (TS) profiles each night. They
recently migrated to Exchange 2003, but due to application integration
limitations, they are only using Outlook XP to access it.

Here's the question... since they delete their profiles nightly, we used the
Custom Installation/Custom Maintenance Wizards to set up new profiles each
time they log onto a Citrix Server. the one thing I can't seem to get as a
default is the checkbox for them to use their Contacts as an Outlook Address
Book. Users need to check this box at least daily.

Is there ANY way (Custom Maint/Inst wizard; reg hack; 3rd party slothware;
etc) to have that box checked by default?

Many Thanks!