An account locks out when you use an incorrect credential in Outlook 2016

Applies to: Outlook 2016

Symptoms


If you type an incorrect set of credentials, and then cancel a passwordprompt, Outlook may continue to send requests with the incorrect set ofcredentials. This could cause an account lockout.

Resolution


More information


If you need to revert this fix, use the AllowRequestsInNeedPasswordBehavior registry key and set its value as follows:

Location: HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Security
Value Name: AllowRequestsInNeedPasswordBehavior
Type: DWORD

The default value of this registry key is 0. It's used to disallow both legacy and MAPI/HTTP providers to send requests during Need Password. 

If the value of the registry key is set to 1, legacy providers can send requests, but MAPI/HTTP providers can't. 

When the value of the registry key is set to 2, legacy providers can't send requests, but MAPI/HTTP can.

Any values greater than 2 allow both legacy and MAPI/HTTP providers to send requests, even if it could lead to an account lockout.