To enable MFA for Office 2013 client apps, you must have the following software installed (the version listed below, or a later version) based on whether you have a Click-to-run based installation or an MSI-based installation. For more information, see Basic authentication in exchange online. This means that if Outlook 2013 is not configured to use modern authentication, it loses the ability to connect. HKEY_CURRENT_USER\Software\Microsoft\Office\15.Basic authentication is turned off for Exchange Online mailboxes on Microsoft 365. HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Common\Identity HKEY_CURRENT_USER\Software\Microsoft\Exchange Reg add HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Common\Identity /v "Version" /t REG_DWORD /d 1 /f Reg add HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Common\Identity /v "EnableADAL" /t REG_DWORD /d 1 /f To enable the feature, either open an elevated CMD and paste these commands in or add the entries manually via Registry Editor.ĬMD: reg add HKEY_CURRENT_USER\Software\Microsoft\Exchange /v "AlwaysUseMSOAuthForAutoDiscover" /t REG_DWORD /d 1 /f You should update to a newer and supported version soon, as things might stop working without notice. While this procedure will allow you (for now) to connect to Office 365, it is critical to remember that connection to Office 365 and Exchange Online via Office 2013 is not supported anymore. This process will activate the Modern Authentication workflow for all the apps included in Office 2013 (Outlook 2013, Excel 2013, Word 2013, OneNote, etc.), not just Outlook. Modern authentication is already enabled by default in Office 2016 and later versions. This is quickly done by adding some registry keys. Since Microsoft will soon start to turn off Basic Authentication for Exchange Online, you’ll have to enable Modern Authentication client-side if you still have some machines running Outlook 2013 and want them to connect to Office 365.
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