As you know that you can open all ports for any application. Therefore you need to know what needs to be opened.
The following table shows us that which port Office 365 uses. You don’t need to open more than these ports.
| Protocol /port | Applications |
| TCP 443 | AD FS (federation server role)
AD FS (proxy server role) Office 365 portal Office 365 My Company Portal Outlook 2010 and Office Outlook 2007 Microsoft Entourage 2008 for Mac Exchange Web Services/Outlook for Mac 2011 Outlook Web App SharePoint Online Lync client (communication to Lync Online from on-premises Lync Server 2013) |
| TCP 25 | Mail routing |
| TCP 587* | Simple Mail Transfer Protocol (SMTP) relay |
| TCP 143/993 | Simple IMAP4 migration tool |
| TCP 995** | POP3 |
| TCP 80 and 443* | Azure Active Directory Sync tool
Simple Exchange Migration Tool Simple IMAP Migration Tool Staged Exchange Migration Tool Exchange Management Console Exchange Management Shell Office 365 ProPlus |
| PSOM/TLS 443 | Lync Online (outbound data sharing sessions) |
| STUN/TCP 443 | Lync Online (outbound audio, video, and application sharing sessions) |
| STUN/UDP 3478 | Lync Online (outbound audio and video sessions) |
| TCP 5223 | Lync mobile client push notifications |
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