I just finished migration from 2003 to 2008 and everything seems done well.
But i have one strange problem. I can access to the owa localy from the server and from other computers on the LAN by typing [URL]https://servername/owa[/URL] & [URL]https://myexternaldomainname/owa[/URL].
But i have no access from WAN.
It looks like port 443 not opened, but it is. I have telnet access.