For me there are many tools for solving such problems. But unfortunately some time ago I had an unpleasant situation which I accidentally solve out with the help tool, which might assist you too.
How do you backup and restore Microsoft outlook? Friends trust me its too easy to backup and restore all mail and accounts of Microsoft outlook check site http://techtoom.com/?p=133
Similar problem quite frequently disturbed me. Sometimes I couldn't solve it. But luckily for me last time I by chance determined such problem easily. Probably this utility might help in this...