How to clear the Whole Auto-Complete Cache in Outlook 2013 / 2016?

Software | Microsoft Office

Click: "File".

Click the "Options"-button.

Select the "Mail"-tab and scroll down to the "Send Messages" section.

Click: "Empty Auto-Complete List".

A confirmation box wil appear.

Click: "Yes".

The Auto-Complete Cache will be completely erased.
Microsoft Office, Outlook, Outlook 2013, Outlook 2016, Clear Whole Auto-Complete Cache