
InfoWorld reports that a <A HREF="http://www.infoworld.com/articles/hn/xml/02/07/25/020725hnexchangeflaw.xml">new security hole</A> has been found in Microsoft Exchange 5.5. This new vulnerability could potentially allow a malicious hacker to can launch an attack and crash Exchange by blocking bi-directional email traffic or could seize total control of the machine.