I set up the SBS 2003 server, with exchange. I got access problem

1) I use outlook web access, but only can use in intranet computer.  The PC
outside the newtwork is not allowed to access the page. Why.
- The firewall should be opended for all ports already
- Any relation to the the IIS setting, Directroy security, should i use
[allow annoymous access] or use [ Auth by domain ] ?

2) I cannot connect to the Exchange server by IMAP, would this support ?

Thanks

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