Recently upgraded my NZ Vodafone Jasjam to WM6 and glad I did, it has never worked better, but have a question or two.

I connect to a wireless network at work and although the browser will connect and open any page, my windows live messenger or email applications will not connect. 
When not connected to the wireless network all of the applications work seamlessly using my vodafone connection, (complete with vodafone charges).  All I want to be able to do is to connect to the windows live messenger and email when on wireless for free at work.  I guess I've just got a setting incorrect.  Anyone connecting in the same fashion or care to share some tips.  Greatly appreciated.