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) |