I sign in with the same credentials that work on desktop Messenger but I get
an error message that it has failed to connect.

HTC TyTn II with WM 6.1 with internet connection using settings for UK O2
PAYG tarriff

I searched and saw some posts on various forums saying others have
experienced this problem. Something to do with a sync problem with your
desktop WLM contacts or problems trying to sync with your desktop picture.

I removed the latter but I still have the problem.

I also had the same problem on my previous PDA running WM 5.

Anyone know a fix please?

Thanks

Peter