I have a hotmail plus account I pay for, and an office live essentials account I pay for, and I just got an address @blackberry.net.
Noone at blackberry or Tmobile or MSN or office live or hotmail can tell me if it is possible to receive these emails on my blackberry.
What is the error message? There are known issues with Hotmail and TMobile. I've been told that an account you pay for should work but that may not always be the case. There was a solution in *THIS* post but it hasn't worked for everyone either.
There's another thread in the 8700 section about a user attempting to set up a BIS account today and having trouble (getting an error) with the T-Mo site.... maybe the same issue? Have you successfully created the account, or are you getting an error message when you attempt to create the account?