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550 5.7.1 Client does not have permissions to send as this sender

When configuring the receive connector in Exchange 2007,  I find out that users using SMTP email client like Outlook Express and Thunderbird can receive email but cannot sent email through Exchange as the SMTP server. They get the following error:

“Protocol: SMTP, Server Response: ’550 5.7.1 Client does not have permissions to send as this sender’, Port: 25, Secure(SSL): No, Server Error: 550, Error Number: 0x800CCC78″

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Facebook for Windows Mobile 6 Phone

I’ve heard about Facebook application on Blackberry.  I’ve also seen a Facebook application on my wife phone, but I don’t have Facebook application on my Windows Mobile PDA.  Usually I used the browser on my PDA to access Facebook.    That was history.  Windows just released a Facebook application for Windows Mobile 6 phone.  I just installed it.  I find something realy nice in the application.  I can have my contacts/friends list shown like my contact list in my phone.  I can easily send message to them or even call them.   It is also easy to capture and upload photos/videos directly from the application.   Actually, I rarely use Facebook.  Sometimes, almost a month I don’t even visit facebook.  Maybe this application will make me visit Facebook more.