![]() ![]() If you have a Microsoft 365 (Office 365) mailbox connected in Outlook, this tab should have an additional field Logon network security. Make sure Anonymous Authentication is not selected here.ĭisable Office 365 Autodiscover in Outlook Somewhere in the fall of 2016, an update was released for Outlook 2016 that enabled a mandatory check of the connection endpoint in the Microsoft 365 (Office 365) cloud. #HOW TO REINSTALL OUTLOOK 2016 365 UPDATE# You can verify this by using the Fiddler or TCPView tools to monitor the attempts to connect to the and servers. If you are using a non-Office365 mailbox or an on-premises Exchange mailbox, Outlook will try to detect detecting your Microsoft account even though the Autodiscover is not pointed to Microsoft 365. You can disable this check for an on-premise Exchange Server. Set-ItemProperty -Path "HKCU:\Software\Microsoft\Office\16.0\Outlook\AutoDiscover" -Name 'ExcludeExplicitO365Endpoint' -Value 1 -Type DWORD –Force Or, using the PowerShell cmdlet Set-ItemProperty: Reg add HKEY_CURRENT_USER\Software\Microsoft\Office\x.0\Outlook\AutoDiscover /t REG_DWORD /v ExcludeExplicitO365Endpoint /d 1 You can make changes to the registry with the following command: Go to the registry key HKEY_CURRENT_USER\Software \Microsoft\Office\16.0\Outlook\AutoDiscover and create a new DWORD parameter named ExcludeExplicitO365Endpoint and value 1. Outlook Prompts for Password After Migrating to Microsoft 365 (EOL) The ExcludeExplicitO365Endpoint registry parameter is applicable to Outlook 20 (this key is in addition to the list of keys that determine how Autodiscover is performed when Outlook starts). #HOW TO REINSTALL OUTLOOK 2016 365 PASSWORD# ![]() If your mailbox has been migrated from on-premises Exchange to Microsoft 365 or you have two mailboxes connected in Outlook (one from the on-premises Exchange, the second from Microsoft 365/Exchange Online) and you use an RPC connection. In this case, Outlook doesn’t use Modern Authentication (also used for MFA).
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