On most schools and workplaces windows live messenger is blocked but if you still want to use msn you can try one of the wbsites listed below. These websites contain webmessenger services and are not blocked in most cases.

E-Buddy - http://www.e-buddy.com MSN

Online Messenger - http://webmessenger.msn.com

ILoveIM - http://www.iloveim.com

Meebo - http://www36.meebo.com

MessengerFX - http://www8.messengerfx.com

KoolIM - http://www.koolim.com

Instant-t- Express - http://express.instan-t.com