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1. Microsoft Outlook Will Not Open Mac Os
2. Microsoft Outlook Will Not Open On My Mac

Symptoms

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

Outlook for Mac adds new authentication flow for Google IMAP in Insider Fast. (Safari) or 'Open Microsoft Outlook.app' (Chrome) before the browser page loads Google.com (within about 3 seconds after clicking 'Allow' on the permissions page). This will successfully redirect back to the Outlook app and authentication will complete. You cannot open a shared calendar in Outlook for Mac. Contenu fourni par Microsoft. You cannot open one or more of the shared Calendar folders in Microsoft Outlook 2016 for Mac or Outlook for Mac 2011. In Outlook 2016 for Mac and Outlook for Mac 2011, you cannot open a shared Calendar folder that is not a sub-calendar of the user's.

This article describes some useful tools for Microsoft Outlook for Mac. More information Outlook Search Repair. This closes Outlook if it's open, and then resets the preferences to their default settings. Exit the Outlook Reset Preferences tool.

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.

Microsoft Outlook Will Not Open Mac Os

Note

These steps affect all Office applications that use modern authentication.

Microsoft Outlook Will Not Open On My Mac

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.