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Default ports for Outlook for Mac 2011

Office for Mac 2011 will reach end of support on October 10, 2017. To stay supported, you will need to upgrade. For more information, see these resources.

 

Applies to: Office for Mac 2011

Topic Last Modified: 2015-03-09

Microsoft Outlook for Mac 2011 uses default ports for standard communication protocols. Your network and account configuration may require some or all of the ports that are listed in the following table.

Default port Used for

80

HTTP

Exchange Web Services uses HTTP for functions such as synchronizing mail, public folders, contacts, and events.

443

HTTPS

HTTP with Secure Sockets Layer (SSL), if SSL is enabled for Exchange Web Services

53

DNS queries

To locate the Active Directory global catalog server for a user account, Outlook sends DNS queries to DNS servers.

1023 (and higher)

DNS query responses

3268

LDAP global catalog searches

To obtain Global Address List (GAL) data, Outlook sends LDAP queries to the Active Directory global catalog server.

3269

LDAP global catalog searches with SSL

389

Other LDAP searches and authentication and domain password expiration check

636

Other LDAP searches with SSL and authentication and domain password expiration check

25

SMTP and SMTPS (SSL/TLS)

Many ISPs now use port 465 or port 587.

143

IMAP

993

IMAP (SSL)

110

POP

995

POP (SSL)