friend cannot see me on msn

[Andreas Berglund <andreas.berglund@home.se>]

Hi!
I just added a friend of mine on msn. I can see her and I can send 
messages to her but when I'm online it looks to her like I'm offline and 
none of her messages reach me. She tried to send an invitation to me 
several times but none of them reached me. I have no idea where to even 
begin looking so any help would be very much appreciated.
The client I'm using is kopete 0.12.3, I don't know what client my 
friend uses but if you need to know I can ask her and I'd be happy to 
provide any other information that might be relevant.

regards
Andreas Berglund