Are you trying to activate Outlook with an Office Home and Student 2016 license? The Office Home & Student license does not come with Outlook. If you would like to use Outlook, you can switch to a different Microsoft 365 home subscription.If you would like to keep the license you have, we recommend you drag the Outlook app to Trash to delete it. If you have a Microsoft 365 work or school. Expand your Outlook. We've developed a suite of premium Outlook features for people with advanced email and calendar needs. A Microsoft 365 subscription offers an ad-free interface, custom domains, enhanced security options, the full desktop version of Office, and 1 TB of cloud storage. Then, Ctrl+click or right-click on that folder, and hit on Properties to fix Mac Outlook 2016 cannot connect to Exchange Server Go to the General tab followed by clicking on Empty Cache. Once the folder is empty, Outlook will automatically download the items from the server. If you've installed the most recent macOS update (released in December 2016), Outlook for Mac might stop accepting your password, which used to work just fine. To fix this, repair the Outlook client configuration files that were corrupted. Quit Outlook for Mac. In your Applications folder, find and open Keychain Access.

• Outlook 2016 Cannot Start Microsoft Outlook
• Outlook 2016 Outlook Cannot Logon
• Outlook Cannot Log On Error

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Symptoms

In Microsoft Outlook 2016 for Mac, you are repeatedly prompted for authentication while you're connected to your Office 365 account.

Cause

This issue occurs because of the presence of duplicate tokens in the keychain.

Resolution

To resolve this issue in Outlook 2016 for Mac, install the February 2017 Outlook update (version 15.31.0) from the following Office website:

Workaround

To work around this issue, delete any cached passwords for your account, and also delete any modern authentication tokens from the keychain. To do this, follow these steps.

Note

These steps affect all Office applications that use modern authentication.

1. Quit Outlook and all other Office applications.

2. Start Keychain Access by using one of the following methods:

   • Select the Finder application, click Utilities on the Go menu, and then double-click Keychain Access.
   • In Spotlight Search, type Keychain Access, and then double-click Keychain Access in the search results.

3. In the search field in Keychain Access, enter Exchange.

4. In the search results, select each item to view the Account that's listed at the top, and then press Delete. Repeat this step to delete all items for your Exchange account.

5. In the search field, enter adal.

6. Select all items whose type is MicrosoftOffice15_2_Data:ADAL:<GUID>, and then press Delete.

7. In the search field, enter office.

8. Select the items that are named Microsoft Office Identities Cache 2 and Microsoft Office Identities Settings 2, and then press Delete.

9. Quit Keychain Access.

   Note

   When you start Outlook, you are prompted to authenticate.

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Pre-Flight Check

• These instructions are intended specifically for setting up a new email account in Microsoft Outlook 2016 for Mac OS X 10.11.3.
• If you have not already created an email address on your server, visit our New User Tutorial: Creating E-Mail Addresses in cPanel.
• If you need to configure your email address in Outlook 2016 for Microsoft Windows, see How To Set Up Email in Outlook 2016. For other mail clients, check out our tutorial on setting up other email clients.

Step #1: Add or Edit the Email Account

1. To set up a new email account or edit the settings on an existing one, click the Tools menu and then select Accounts to open the Accounts panel.
2. The setup process is slightly different depending on whether you have any existing email accounts configured in Outlook 2016:
   • Setting up your first email account: If this is your first time setting up Outlook 2016, you will need to click on the envelope icon next to the third option: Other Email (iCloud, Google, Yahoo!, or other accounts):
   • Setting up an additional email account: Once any email account has been set up in Outlook 2016, additional accounts can be added by clicking the plus sign in the lower left corner and selecting Other Email… from the pull-down menu:
   • Changing the settings for an existing email account: Click on the account’s name in the account list on the left to make changes to any existing account in Outlook 2016, and skip ahead to Step #4: Editing an Existing Email Account.
     Note: You cannot edit an existing email account to directly change its connection method. To change an account from POP to IMAP or vice versa, simply add a new account for the email address as described below and select the desired connection type. Outlook 2016 will allow you to have multiple accounts for the same email address, so an account for sample@example.com using IMAP can coexist with an account for sample@example.com using POP. To prevent data loss, do not delete the existing account before adding a new one.

Step #2: Configuring a New Email Account

On the account information panel, enter the information as follows:

• E-mail address: requires your complete email address, such as sample@example.com.
• Password: is the password associated with the email account.
• User Name: is your full email address. It should exactly match what you entered into the E-mail address field above.
• Type: you may select IMAP or POP. IMAP is recommended for its ability to sync messages between multiple devices (to learn more about the difference between the protocols, see IMAP vs POP3 email).
• Incoming server:
  • When using standard (non-SSL) settings, use mail.yourdomainname.com
  • When using secure (SSL) settings, use the server’s hostname (host.yourdomainname.com)
  • The default port numbers should not need to be changed unless you have configured your server to use non-standard ports (not common)
  • Check the box next to Use SSL to connect (recommended)
• Outgoing server:
  • When using standard (non-SSL) settings, use mail.yourdomainname.com
  • When using secure (SSL) settings, use the server’s hostname (host.yourdomainname.com)
  • The default port numbers should not need to be changed unless you have configured your server to use non-standard ports (not common)
  • Check the box next to Use SSL to connect (recommended)

Once you’ve entered all the requested information, click the Add Account button at the bottom of the window to create the account with your specified settings.

Step #3: Configure Security Settings

When you add your email account, an alert window may prompt you to review security settings. This is expected if you have not already purchased and installed a signed, third-party verified SSL certificate on your mail server. If you see no such prompt, then you’re all set and can begin using Outlook 2016 with your email account immediately.If you do get a security prompt, which specifies that information that you view and send will be encrypted, note that Outlook 2016 will not be able to verify the security of the certificate through a third-party because you are the only authority validating it:If you wish to proceed with the connection, you have two options:

• You can click the Continue button to proceed, with the caveat that you may need to accept the warning each time Outlook connects.
• Or, you can permanently store the certificate and treat it as trusted, by clicking Show Certificate and then checking the box next to Always trust … before clicking Continue. You will need to authenticate with your password to store the exception for your self-signed certificate.

Outlook 2016 Cannot Start Microsoft Outlook

Once connected, Outlook 2016 will download your mail from the server along with any custom directories you’ve added, which will be synced by default.

Step #4: Editing an Existing Email Account

To change the settings on an existing email account, click the Tools menu and then select Accounts to open the Accounts panel.Click on the name of the account in the left pane, and make the desired changes:

• User Name: is your full email address. It should exactly match the value of the E-mail address field above.
• Password: is the password associated with the email account.
• Incoming server:
  • When using standard (non-SSL) settings, use mail.yourdomainname.com
  • When using secure (SSL) settings, use the server’s hostname (host.yourdomainname.com)
  • The default port numbers should not need to be changed unless you have configured your server to use non-standard ports. If you do need to configure mail on a different port, you can check the box next to Override default port and enter the appropriate incoming mail server value (POP3 should be 110 for non-SSL connections and 995 when using SSL; IMAP should be 143 for non-SSL connections and 943 when using SSL.)
  • Check the box next to Use SSL to connect (recommended) for a secure connection.
• Outgoing server:
  • When using standard (non-SSL) settings, use mail.yourdomainname.com
  • When using secure (SSL) settings, use the server’s hostname (host.yourdomainname.com)
  • The default port numbers should not need to be changed unless you have configured your server to use non-standard ports. If you do need to configure mail on a different port, you can check the box next to Override default port and enter the appropriate outgoing mail server value (25 for non-SSL connections and 465 when using SSL; Unlike many other mail clients, Outlook 2016 does not require you to use port 587 on Mac OS X).
  • Check the box next to Use SSL to connect (recommended) for a secure connection.
  • The More Options… button will allow you to configure authentication for the outgoing (SMTP) mail server:
    • Authentication: Typically, Use Incoming Server Info is sufficient, but if you receive connection errors due to SMTP authentication, you may need to select User Name and Password. Do not select None; you will not be able to send mail if None is selected as the authentication type.
    • User Name: This field can only be filled in if you use the User Name and Password authentication type. If enabled, it must be the full email address.
    • Password: This field can only be filled in if you use the User Name and Password authentication type. If enabled, use the email account’s password.

Bonus: Select IMAP Folders to Sync

By default, Outlook 2016 for Mac OS X will sync all IMAP folders. To specify which ones you want to sync, pull down under the Tools menu and select IMAP Folders… to bring up the Folder Browser.In the Folder Browser, you will see a list of your accounts in the left pane.

Outlook 2016 Outlook Cannot Logon

• In the first pane, click on the IMAP account’s name
• In the second pane, click on INBOX (or the desired custom folder, if listed)
• In the third pane, click on the folder to which you want to subscribe or unsubscribe.
• Folders to which you already are subscribed will be displayed in bold type, while folders to which you are not currently subscribed will be displayed in a light-face font. Note that on some versions of Mac OS X, the distinction can be almost imperceptible.
• Clicking on the name of a folder to which you are subscribed will allow you to click the red ( – ) Unsubscribe button in the top-left menu, and clicking on the name of a folder to which you are not subscribed will allow you to click on the green ( + ) Subscribe button in the top-left menu.
• You can not unsubscribe to default account folders, such as Drafts, Junk, Sent, and Trash.

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