Are you sure you've added the account into your account settings? Also are you clicking on check mail, or have you set Tbird to automatically download messages on a regular basis?
When you click on Get mail, do you see the status bar at the bottom of Tbird? does it seem to complete, or just sit there never quite finishing?
Edit: also, in your account settings under server settings, have you ticked "automatically download new messages"?
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