

If you’re on Mac OS High Sierra or an earlier version, the procedure will be different. Go to System Preferences and select Software Update from the drop-down menu.To upgrade the Mac OS version, follow the procedures below: Method 3: Ensure You Are Running the Updated Outlook and Mac OS By clicking the Return key, select the selected file and rename it to osfcore.Look for the framework file in the frameworks folder to fix the “unable to open Outlook on Mac” issue.

When you right-click on Microsoft Outlook, choose Show Package Contents from the context menu.In the Finder window, go to the Application.This problem can be simply solved by renaming the file to the amework.įollow the instructions below to solve this issue: The Mac Outlook 2016 application package is looking for a file called osfcore.

The file is called amework in this example. Moving on to the next workaround! Method 2: When the Main File System Is Case-sensitive “Unable to Open Outlook on Mac” Error Occurs If you find that there are no updates for your Office 365 program, then you can jump to the next solution or go to the method that solves your type of problem from the above section.
