Microsoft Office 365 port requirements
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| Sr No | Protocol | Port | Usage |
| 1 | TCP | 443 | Office 365 portal (admin and user), Outlook, OWA, SharePoint |
| 2 | TCP | 25 | Mail routing |
| 3 | TCP | 587 | SMTP relay |
| 4 | TCP | 143/993 | IMAP Simple Migration Tool |
| 5 | TCP | 80/443 | Microsoft Azure Active Directory Sync tool, mail migration tools, |
| 6 | TCP | 995 | POP3(S) |
| 7 | PSOM/TLS | 443 | Lync Online – outbound data sharing |
| 8 | STUN/TCP | 443 | Lync Online (outbound audio, video, and application sharing |
| 9 | STUN/UDP | 3478 | Lync Online (outbound audio and video sessions) |
| 10 | TCP | 5223 | Lync mobile client push notifications |
| 11 | UDP | 20000-45000 | Lync-to-phone outbound |
| 12 | RTC/UDP | 50000-59000 | Lync (outbound audio and video sessions) |
For more information on port requirements, check Office 365 portal.
