Microsoft Outlook 2016 Mac Help

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  1. Microsoft Outlook Mac Support
  2. Office Help
  3. Microsoft Support

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

Microsoft Outlook Mac Support

Microsoft Outlook met een Office 365-abonnement is de nieuwste versie van Outlook. Vorige versies omvatten Outlook 2013, Outlook 2010 en Outlook 2007. De beschikbaarheid van mobiele apps verschilt per land/regio. Kijk wat er beschikbaar is in jouw land/regio.

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.

Talk to your IT department for install help. Once the download has completed, open Finder, go to Downloads, and double-click MicrosoftOffice2016Installer.pkg (the name might vary slightly). Can I install Office 2016 for Mac and Office for Mac 2011 on the same computer? Help and support for the Microsoft Outlook app on PC, Mac, and mobile. Find how-to articles, watch video tutorials, and get the most out of your Office 365 subscription.

Office Help

Note

These steps affect all Office applications that use modern authentication.

Microsoft Support

  1. Quit Outlook and all other Office applications.

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  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.

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  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.