Firewall Ports for Office 365
Server/ServicePortProtocolDirectionADFS (Internal)443TCPInbound/OutboundADFS (Proxy DMZ) or WAP Server443TCPInbound/OutboundMicrosoft Online Portal (Website)443TCPInbound/OutboundOutlook Web Access (Website)443TCPInbound/OutboundLync/Skype for Business Client443TCPInbound/OutboundSharePoint Online (Website)443TCPInbound/OutboundOutlook for Mac443TCPInbound/OutboundOutlook Client443TCPInbound/OutboundMail Routing25TCPInbound/OutboundSMTP Relay (requires TLS)587TCPInbound/OutboundSimple IMAP4 migration Tool143/993TCPInbound/OutboundPOP3 (requires SSL)995TCPInbound/OutboundDirSync/Azure Active Directory Sync80/443TCPInbound/OutboundExchange Migration Tool80/443TCPInbound/OutboundIMAP Migration Tool80/443TCPInbound/OutboundExchange Management Console80/443TCPInbound/OutboundExchange Management Shell80/443TCPInbound/OutboundLync (Data Sharing Sessions)443TCPOutboundLync (Video, Audio, Application Sharing)443TCPOutboundLync (Audio & Video)3478UDPOutboundLync (Audio & Video)50000-59999TCP/UDPOutboundLync Mobile Push iOS Only5223TCPOutbound It should be noted that 3rd party certificate revocation will be required which is carried out normally anonymously on port 80 so any proxies/firewalls routing the traffic should expect this. Depending on your provider you may be able to get the CRL URL in advance but for Office 365 this is not as simple.
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