About signing in to the win messenger

From: rcerdena (anonymous_at_discussions.microsoft.com)
Date: 04/29/04 

Date: Thu, 29 Apr 2004 12:01:04 -0700

When I sign in, I see an historial of previous email addresses/persons that have signed in before....how do I do to no to keep a record of the previous sign-ins?? I just want that fiel blank, so that everybody types their email address again, but the system doesnt keep a record of this.....Any help??