MSN Messenger and Motorola Q

When using Pocket MSN on a Windows 5 Mototola Q i get the error message:

"Info
---
Sign in to MSN Messenger Service failed because the service is not
responding. Try again later."

I can login to "MSN Mobile Home" (via the browser on the Q). And I can
successfully login from my desktop to Messenger, so I know that service works.

Why is the Pocket MSN failing to connect?