Auto discover in Outlook can help you to access offline address book. Sometimes auto discover stops working in outlook account despite you put in correct CNAME in search. Hence to fix if auto discover is not working in outlook, you will have to follow the below steps.
Fix auto discover issue in outlook through registry editor
- Close the outlook application.
- Open up the Windows Registry Editor then click Start > Run.
- In the dialog box, type regedit then press ENTER.

- Go to: HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\Autodiscover.
- Find the folder called BOOT then delete it.
- To delete, simply right click the folder and select ‘Delete‘.
- Now launch MS outlook for error free operation.
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Microsoft Outlook
Operating System Windows 7/10