Sign In dropdown list

From: Paul Robinson (alitor99_at_NOSPAMHEREbtinternet.com)
Date: 08/28/04 

Date: Sat, 28 Aug 2004 01:40:01 +0100

When I Sign In to .Net Messenger Service the emailaddress window is a drop
down list of what looks like every Messenger user who has ever signed in on
the machine plus a few others. I would like to edit this list and delete the
obsolete names. Where will I find the list to edit it?