It is possible to use different protocols to connect to your Exchange mailbox, each protocol has it's own supported features.

MAPI connection to the Exchange server provides you with the full functionality of all services that Exchange has to offer using Outlook:

  • Direct live connection to the mail server.
  • Shared Inbox, Calendar, Contacts, Tasks, Notes and free/busy information for scheduling.
  • Public folders.
  • Out of Office Assistant.
  • Server-side rules and alerts.
  • Optional server-side spam management.

IMAP/SMTP connection to the Exchange server allows the limited functionality:

  • Direct live connection to the mail server.

POP/SMTP Connection offers the least functionality:

  • Send and receive email items only. Note: custom folders or subfolders will not be synchronized with the server

All connection types allow you to keep messages on the server and to view your mailbox using Outlook Web Access in any web browser.

Important: POP and IMAP protocols do not allow to syncronize Calendar, Contacts, Tasks, Notes and free/busy information for scheduling.

For information about different types of mailboxes, read  What Is The Difference Between Exchange, POP/IMAP And OWA-Only Mailboxes?