Righty ho dudes and dudettes as many of you may have noticed microsoft has been taking steps to block users from connecting to the messenger network with the recently leaked messenger 7.
Siebe the wonderfull guy from Bot2k3.net has come up with this patch to solve the problem.
Make sure you completely shutdown messenger then extract the zip, find the messenger exe and hit patch. The backup is optional.
You use this patch at your own risk.
Moderator edit: patch removed, see this post by Patchou (and that entire thread).