We are currently configuring Sonic Wall NSA 2400 firewall. I am not sure what ports I need to open on the firewall for MS Exchange Server 2007 SP1 inbound and outbound traffics. Our Exchange Serveris configured with all roles except for Edge Transport one. Thank you so much in advance.

Please check below article for the same http://technet.microsoft.com/en-us/library/bb331973.aspx Vinod |CCNA|MCSE 2003 +Messaging|MCTS|ITIL V3|

It depends on what all services you want to publish over the internet. But here are basic ports to open for inbound or outbound traffic... Mail Flow/SMTP - 25 (and465 for smtp over TLS) Outlook Anywhere, OWA, ActiveSync, Autodiscover, Availability- 80,443 POP - 110,995 IMAP - 143,993 Amit Tank | MVP Exchange Server | MCITP: EMA | MCSA: M | http://ExchangeShare.WordPress.com

We just need users to get access their e-mails using OWA from home and to keep synchronizing their mailboxes contents with their MS Windows Mobile devices. It seems like we should open only 80,443 ports on the firewall for incoming from Internet traffic? Is that right?

80/443 for OWA, AS or Windows Mobile but since Exchange 2007 requires SSL so 443 is perfect. For internet mail flow you need to open port 25 for SMTP traffic from your Hub Transport server role...Amit Tank | MVP Exchange Server | MCITP: EMA | MCSA: M | http://ExchangeShare.WordPress.com

Perfect. We can start configuring it. Thank you so much.