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Users running Microsoft Outlook to retrieve their email from Microsoft Exchange Server will be prompted to re-enter their credentials after changing their Active Directory account password.

Users of Outlook 2016 on Windows 10 Version 1703 and above, including the Outlook version installed with Microsoft Office 365 may experience a blank dialog opening when clicking on Type Exchange Password & Connect which disappears after a few seconds and will be unable to enter their updated account credentials.

This is caused by a bug in the Active Directory Authentication Library (ADAL) implementation in the Web Account Manager (WAM) in Windows 10. This can be worked around by forcing Outlook to use its own built-in implementation of ADAL, instead of the implementation in Windows. This requires a modification to the registry at path HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\Identity, setting the value of DisableADALatopWAMOverride to 1.



Making changes in the registry can cause Windows or applications you have installed to stop working or function incorrectly. Use caution when making changes in the registry and take a backup first if you are unsure.

Restart Outlook for the change to take effect and try again to enter the updated account credentials. It may be necessary to reboot the computer for this change to take effect completely.


This registry change is made to a registry location that only affects the currently logged-in Windows user account. if multiple users share one computer, it will be necessary to make this change for each user who experiences the error. This change also will not replicate to other computers those users log in to if they do not have roaming user accounts.