Microsoft Outlook 2016 Not Opening On Mac



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

  • This tool resets customization that you've made to Outlook from the Outlook menu Preferences. It also restores Outlook window size and position settings. Set Default Mail App. This tool lets you choose Outlook for Mac as your default mail application. Then Outlook opens a new email whenever you click on a mailto: link in an email or website.
  • Mar 19, 2020  Tech support scams are an industry-wide issue where scammers trick you into paying for unnecessary technical support services. You can help protect yourself from scammers by verifying that the contact is a Microsoft Agent or Microsoft Employee and that the phone number is an official Microsoft global customer service number.
  • Nov 14, 2019  This problem occurs if the underlying file system is formatted as case-sensitive. In this scenario, the file is named OsfCore.framework. However, Outlook 2016 for Mac looks for a file that is named osfcore.framework and cannot find the file inside the app bundle.
  • To resolve this problem, make sure that your computer meets the Outlook 2016 system requirements, Outlook 2013 system requirements or Outlook 2010 system requirements. Note These steps are provided in a specific order based on commonality and complexity. Follow these steps in the given order.


Microsoft Outlook 2016 Not Opening On Mac Free

You can help protect yourself from scammers by verifying that the contact is a Microsoft. Outlook for Mac 2016 won't open - dock icon bounces then stops.

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


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



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 Won't Open On Mac


Outlook 2016 Will Not Open

These steps affect all Office applications that use modern authentication.

  1. Quit Outlook and all other Office applications.

    Mac does that, too. With macOS, it’s easy to transfer your files, photos, and other data from a Windows PC to your Mac. Work with popular file types such as JPEG, MP3, and PDF, as well as Microsoft Word, Excel, and PowerPoint documents. And, of course, you can run Microsoft Office natively on a Mac. Microsoft for mac air download. The Windows 10 Home operating system offers built-in security and apps like Mail, Calendar, Photos, Microsoft Edge, and more to help keep you safe and productive.

  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.

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  9. Quit Keychain Access.


    When you start Outlook, you are prompted to authenticate.