Outllok 2003 rules problem

This may be an easy one, but I still hope you will be able to help....

Outlook; someone created an enormous amount of rules (about 50 I think). They used to work up until a week ago, but suddenly stopped working automatically.

When I choose to go into the wizard and click on 'run now' the rules all work and are doing what they are supposed to do. The thing is that this should be done automagically but it isn't happening.

The fact the the rules work through run now, suggests that the rules themself are fine, it's just something in Outlook that's preventing something.There are server and client based rules, but this person is on the network and can access all pst's she's supposed to.

Anyone?

 

First thing I'd try is a repair of MS Office. Should be an option in add/remove.

If that doesn't get things working again, what OS?