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Disable ADAL for Outlook 2016

Posted on February 23, 2021 By rich No Comments on Disable ADAL for Outlook 2016
Problem

Various authentication issues including:

  • O365 profiles sets up instead of on prem mailbox
  • Outlook wont authenticate on Office 365
  • Outlook wont authenticate on Office 365 with SSO
Cause

ADAL is the new authentication method for azure cloud solutions. It over-rides the standard kerberos, basic and NTLM protocols.

Solution

ADAL can be disabled by registry key:

To disable modern authentication on a device, set the following registry keys:

Registry key

    Type

       Value

HKCUSOFTWAREMicrosoftOffice16.0CommonIdentityEnableADAL

    REG_DWORD

        0


Reference, Links and Imges

https://answers.microsoft.com/en-us/msoffice/forum/msoffice_outlook/modern-authentication-on-outlook-2016-keeps-on/98a263f4-ab9c-4d6f-b5eb-2728a8e77412 

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