This article explains how to disable Autodiscover for Microsoft 365 in the Outlook registry. This is necessary, for example, if you are using a Hosted Exchange mailbox from SwissCenter. This prevents Outlook from always trying to connect to the domain registered in Microsoft 365.
To customize the Microsoft Windows registry, proceed as follows:
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In the search field located in the taskbar, type regedit and press Enter.
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In the registry editor, select the following key in the navigation bar on the left: \HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Autodiscover
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Right-click on the key.
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Click on New > DWORD (32-bit) Value. The DWORD value is created.
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Name the DWORD value as follows: ExcludeExplicitO365Endpoint
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Double-click on the newly created DWORD value. The Edit DWORD (32-bit) Value window opens.
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In the Value field, enter the value 1 and click OK.
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Create another DWORD (32-bit) value.
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Close Outlook and then reopen the software.
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If you have already configured a profile and, if applicable, an email account, you must then reconfigure them.
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The Autodiscover feature for Microsoft 365 is now disabled.