Hopefully, most companies and individuals are up-to-date on Microsoft security patches.  This new exploit has just been developed from the MS05-030 security bulletin published in June. It could be adapted for use in future computer viruses and worms. 

MS05-030: Microsoft Outlook Express NNTP Buffer Overflow Exploit
http://www.frsirt.com/exploits/20050624.MS05-030-NNTP.c.php

MS05-030: Cumulative Security Update in Outlook Express (897715)
http://www.microsoft.com/technet/security/Bulletin/MS05-030.mspx