-->![Outlook For Mac Crashing Outlook For Mac Crashing](/uploads/1/2/6/6/126667335/785274940.png)
![Outlook 2011 for mac keeps crashing Outlook 2011 for mac keeps crashing](/uploads/1/2/6/6/126667335/798488668.png)
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. When you start Outlook for Mac 2011, the application crashes or hangs. IMPORTANT The location of certain files are different if you have Service Pack 2 (SP2) installed. To check if it is installed, open Word, and then click About Word from the Word menu. If you would like to provide further details please include the information from the crash log for further investigation. Open a Finder window and go to the Applications folder. Hold down the Control key on your keyboard and click on the Microsoft Outlook icon and pick 'Show Package Contents' from the pop-up menu.
Original KB number: 3014451
Symptoms
![Outlook For Mac Crashing Outlook For Mac Crashing](/uploads/1/2/6/6/126667335/785274940.png)
Microsoft Outlook 2016 for Mac crashes immediately after startup. The crash reporter displays the following error information.
Exception Type: EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000002, 0x0000000000000000Application Specific Information:
Exception Codes: 0x0000000000000002, 0x0000000000000000Application Specific Information:
dyld: launch, loading dependent librariesDyld Error Message:
Library not loaded: @rpath/osfcore.framework/Versions/A/osfcore
Library not loaded: @rpath/osfcore.framework/Versions/A/osfcore
Referenced from: /Applications/Microsoft Outlook.app/Contents/MacOS/Microsoft Outlook
Reason:image not found
Reason:image not found
Outlook For Mac Crashing
Cause
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.
Workaround
To work around this problem, rename the OsfCore.framework file as osfcore.framework. To do this, follow these steps:
- In Finder, open the Application folder.
- Right-click Microsoft Outlook, and then select Show Package Contents.
- Open the Frameworks folder, and then find the OsfCore.framework file.
- Select OsfCore.framework, press Return, and then change the file name to osfcore.framework.
More information
You can use Disk Utility to determine whether the file system is formatted as case-sensitive. To do this, run Disk Utility, select the hard disk drive partition, and then select the Erase tab to view the Format option that's selected. If either of the case-sensitive options are selected, you may experience this problem.
-->Symptoms
In Microsoft Outlook 2016 for Mac, you are repeatedly prompted for authentication while you're connected to your Office 365 account.
Microsoft Outlook For Mac
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
![Outlook 2011 for mac keeps crashing Outlook 2011 for mac keeps crashing](/uploads/1/2/6/6/126667335/798488668.png)
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.
- Quit Outlook and all other Office applications.
- 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.
- In the search field in Keychain Access, enter Exchange.
- 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.
- In the search field, enter adal.
- Select all items whose type is MicrosoftOffice15_2_Data:ADAL:<GUID>, and then press Delete.
- In the search field, enter office.
- Select the items that are named Microsoft Office Identities Cache 2 and Microsoft Office Identities Settings 2, and then press Delete.
- Quit Keychain Access.NoteWhen you start Outlook, you are prompted to authenticate.