Clearing the Office application's cache on a Mac

1. Open Finder.
2. Navigate to Go menu.
3. From the drop-down menu, select «Go to Folder..»
4. Type /Users/{your_name_on_the_device}/Library/Containers/com.microsoft.Outlook/Data/
5. Select all items from Data folder and click delete.
6. Open your Trash in Mac and select «Empty Trash» to permanently delete the data.