On Wed, 26 Dec 2007 14:17:29 +0000, Mike Harrison wrote:

Can anyone help me block these MI5 messages. I've tried using M***5
as a subject line filter in Outlook Express (filtering the root
newsgroup directory), but it doesn't do the job.

I'm quite hazy on anything MS, but, IIRC M*5 will cover anything between
M and 5.