Outlook constantly shows welcome screen in Office 365 for OSX

I found I was having this issue due to a bad .plist file.
For outlook, you would go to ~/Library/Containers/com.microsoft.Outlook/Data/Library/Preferences/

In my case, the 'com.microsoft.Outlook.plist' file was unable to be opened by XCode due to an incorrect format.  I renamed the file by adding '.old' to the end of it and re-started Outlook. 

This re-created a new .plist file. After going through the welcome screen again, it no longer opens after restarting.