Hi all.. I'm try to send mail via outlook express.. It said the sender does not have permission to send as this sender.(Both send outside or send local) I 've tried all settings in the Exchange Managment Console -> Server Configuration -> Hub Transport. Do I need the Edge Transport Roles?( I didn't installed that , cuz not enough computers. I think I'm going to reinstall another clean Exchange 2007. Is there any tutorials on the internet telling how to migrate from Exchange 03 to 07?

By default Exchange 2007 POP3 IMAP SMTP use TLS port. Please make sure you are enable SSL in POP3 and SMTP.Outlook express>Tools>Account>Mail profile>properties>Advanced>click This server requires secure connection(SSL)

Thx. It does work after you enable SSL on SMTP in Outlook Express.