| TCP Ports | Service | Description |
| 21 | FTP | Enable external and internal file transfert |
| 25 | Exchange Server | Enables incoming and outgoing SMTP mail |
| 80 (http://) | IIS | Enable all nonsecure browser access, including: internal access to IIS Webs, OWA and OMA |
| 110 | POP3 | Enables Exchange to accept incoming POP3 mail |
| 123 (UDP port) | NTP | Enables the system to synchronize time with an external network time protocol server |
| 143 | IMAP4 | Enables Exchange to accept incoming IMAP4 - compliant messages |
| 220 | IMAP3 | Enables Exchange to accept IMAP3-compliant messages |
| 443 (https://) | Outlook | Enables all secure browser access, including external access to Exchange for outlook 2003, OWA |
| 444 | Windows Sharepoint Services | Enalbes internal and external access to the SharePoint Web |
| 500 | IPSec | Enables external VPN connections by using IPSec |
| 1701 | L2TP | Enables external L2TP VPN connections |
| 1723 | PPTP | Enables external PPTP VPN connections |
| 3389 | Terminal Services | Enables internal and external terminal services client connections |
| 4125 | Remote web workplace | Enables external OWA access to Exchange, plus internal and external HTTPS access to the client web site |
| 4500 | IPSec | Internet Key Exchange (IKE) network Address Translation (NAT) traversal |