Email address Auto complete not working

[Kris3065]

Running Visa Home 32 bit on a laptop, using Windows Mail/Outlook. The email address auto complete was working then all of the sudden it stopped. Now it will auto complete only email addresses that a message was sent to in the last 24 hours. I checked the settings and they are correct, it should be auto completing. I tried going in and deleting the reg key for that, no help. I restored it. I personally don't use Vista, this is for the bosses wife, so I don't know a lot about what else to do. Any help is appreciated. Thanks