Clearing the drop down name cache in Outlook 2003

Hello,

Just wondering how you can clear Outlook's remebering of names to email addresses in Outlook 2003. For instance, if I type in jbloggs@domain.com in my send entry, it will use the Exchange server to get his display name, Joe Bloggs. However, if I change the display name on the exhcange box, the display name on my computer will still stay the same as the old display name. I was wondering how to clear this cache and reset it so that the new display name may appear.

Thanks