Microsoft plans to distribute Internet Explorer 8 via Automatic Updates starting the 3rd week of April( next week). The update will cover from small user base to large number of users.
For organization that still use old system that need Internet Explorer 6 or Internet Explorer 7 to work with the system organization. The organization can download the IE8 Blocker Toolkit to block the automatic update of IE8.
Note:The blocking tools has to be install by April 20, 2009.