It does not support authentication (SMTP-AUTH) error in Thunderbird 3

It does not support authentication (SMTP-AUTH) error in Thunderbird 3

My OS in Windows 7. I'm using Thunderbird 3 from my home to access office mails. Though my office mail server doesn't support POP3, Thunderbird automagically configures itself when I provide it my email id and password. It can download emails and synchronize with server. However, I get following error when try to send a message:

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Guest [Entry]

http://getsatisfaction.com/mozilla_messaging/topics/thunderbird_2_to_3_0_upgrade_unable_to_authenticate_to_smtp_server_uncheck_use_name_and_password_for_that_server