Adds an option to prevent Outlook 2016 from connecting to an Exchange account unless ADAL is used

To enable this option, install the Description of the security update for Outlook 2016: September 12, 2017 (KB4011091), and then you can set a value to require token authentication to either create or connect to a Microsoft Exchange account as follows:

Important
Follow the steps in this section carefully. Serious problems might occur if you modify the registry incorrectly. Before you modify it, back up the registry for restoration in case problems occur.

1. Exit all Microsoft Office applications.
2. Start Registry Editor:
    
   • In Windows 10, go to Start, enter regedit in the Search Windows box, and then select regedit.exe in the search results.
   • In Windows 7, click Start, type regedit in the Search programs and files text box, and then click regedit.exe in the search results.
   • In Windows 8 and Windows 8.1, move your mouse to the upper-right corner, click Search, type regedit in the search text box, and then click regedit.exe in the search results.
3. Locate and then select the following registry subkey:
   HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\16.0\Outlook\HTTP
4. On the Edit menu, point to New, and then click DWORD Value.
5. Type RequireADAL, and then press Enter.
6. In the Details pane, right-click RequireADAL, and then click Modify.
7. In the Value data box, type 1, and then click OK.
8. Exit Registry Editor.