If your Outlook installation is a part of Microsoft’s Office suite and you face crashing issues or encounter Outlook has stopped working message, uninstalling Office 2016 & reinstalling it again might solve the issue. Doing this has helped many users follow the steps below: Go to Control Panel, and click on Programs and Features. Today we mark the end of support for Office 2010 and Office 2016 for Mac. This means that we’ll no longer provide technical support, bug fixes, or security updates for these products, and organizations that continue to use them may face increased security risks and compliance issues over time. To resolve this issue in Outlook 2016 for Mac, install the February 2017 Outlook update (version 15.31.0) from the following Office website: Release notes for Office 2016 for Mac. To work around this issue, delete any cached passwords for your account, and also delete any modern authentication tokens from the keychain.

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:

Office 365 Keeps Disconnecting To Outlook 2016 For Mac How To Export Contacts To Excel

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

Outlook 365 Mac Setup

These steps affect all Office applications that use modern authentication.

Uninstall Outlook 365 On 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. Touchscreen driver hp. 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.