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Clients Clients Clients Clients Clients
PortExchange On PremisesExchange OnlinePurpose
25/TCP(error)(tick)Mail routing
80/TCP(tick)(tick)

Unencrypted Web Connections of:

  • Internet calendar publishing
  • Outlook on the web (redirect to 443/TCP)
  • Autodiscover (fallback when 443/TCP
    isn't available)
110/TCP(tick)(error)POP3
143/TCP(tick)(tick)IMAP4
443/TCP(tick)(tick)

Encrypted Web Connections of:

  • Autodiscover service
  • Exchange ActiveSync
  • Exchange Web Services (EWS)
  • Offline address book (OAB) distribution
  • Outlook Anywhere (RPC over HTTP)
  • Outlook MAPI over HTTP
  • Outlook on the web (formerly known
    as Outlook Web App)
587/TCP(tick)(tick)SMTP
993/TCP(tick)(tick)IMAP4 Over SSL
995/TCP(tick)(tick)POP3 Over SSL