What about 0utlook flash-back?

　　Reasons and Solutions:

1, the reason for the flash-back---because you imported the previous Outlook 2011 data so that the new Outlook Flash will not open.

2. Solution:

You do not need to reload, just run the following two lines of command under Terminal "Terminal.app":

Defaults Delete Com.microsoft.Outlook

Killall CFPREFSD

3. When you are done, you must not import the existing data after you open Outlook

4. Where are the data files?

Data files for Office 2011:

~/documents/microsoft User Data/office Identities

Data files for Office 2016

~/library/group Containers/ubf8t346g9. Office/outlook/outlook Profiles/main Profile