Start Registry Editor.

In Windows 10 and Windows 8, press the Windows Key + R to open a Run dialog box. Type regedit.exe and then press OK.

In Windows 7, click Start , type regedit in the Search programs and files box, and then press Enter. Locate and then select the following registry subkey:

HKEY_CURRENT_USER\Software\Microsoft\Office\x.0\Outlook\AutoDiscover

Notex.0 in this registry path corresponds to the Outlook version (16.0 = Outlook 2016, 15.0 = Outlook 2013, 14.0 = Outlook 2010, 12.0 = Outlook 2007).