TCP 443 - 0365 Portal, Outlook, OWA, Sharepoint Online, Lync client, ADFS Federation / Proxy 
TCP 80/443  - Azure AD Syn Tool, Mail Migration Tool, Exchange
TCP 25 - Mail Routing
TCP 587 - SMTP Relay
TCP 143/993 - IMAP Simple Migration Tool
TCP 995 - POP3(S)
TCP 5223 - Lync Mobile client push notifications
PSOM/TLS 443 - Lync Online Outbound Data Sharing
STUN/TCP 443 -  Lync Online Outbound audio, video, app sharing
STUN/UDP 3478 - Lync Online Outbound audio and video sessions
UDP 20000-45000 - Lync to Phone Outbound
UDP 50000-59000 - Lync Outbound audio and video sessions