Tashanna & Josep let me know that RIM has released Windows Live Messenger 2.1.36. This is an update from 2.1.32 released last month. There does not seem to be much new in this release but a few users are reporting that it works on T-Mobile now. Take that for what its worth.
You can pick up the latest version from this link:
or directly from this link:
Let us know if you find anything different!