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). 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. You can disable this check for an on-premise Exchange Server. 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 verify this by using the Fiddler or TCPView tools to monitor the attempts to connect to the and servers. 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. Make sure Anonymous Authentication is not selected here.ĭisable Office 365 Autodiscover in Outlook
If you have a Microsoft 365 (Office 365) mailbox connected in Outlook, this tab should have an additional field Logon network security. If you are using GPO administrative templates for MS Office, this setting can be configured with the policy parameter Online Content Options = Do not allow Office to Connect to the Internet under the following GPO section: Administrative Templates -> Microsoft Office 2016 -> Tools | Options | General | Service Options -> Online Content.
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