I had a hunch on what was causing this and just tried it on mine:
When you are logging in, are you putting for your username the whole email address i.e.
![[email address]](http://www.blackberryforums.com/?emailimage=7298cf180289bb9ff8b23091092fa808)
? If it's a hotmail, msn or live account, you just need to put the username part. When I put in the full hotmail email address it gave me the error you are talking about.
If you look below the username field, you will see field called domain. If you use hotmail.com, msn.com or live.com, you pick it from the dropdown. If you have a different login, pick the Other email address and put your email address in the username field.