Do you have smtp.office365.com for the server, not something like smtp-mail.outlook.com? Also, the incoming server should be outlook.office365.com.

sfhowes: Thanks for your help. Checked that and this is all I get for options (See attached)

I don't know why OAuth2 doesn't appear in the drop-down, as it does in my setup. Open Config. editor from Settings/General and type mail.smtpserver.smtp1.authMethod in the search box (or change 1 to 2 or 3 to correspond to the outlook account (mail.server.server1.name displays the hostname of server 1). Edit mail.smtpserver.smtp1.authMethod and change the value to 10, then see if OAuth2 appears in the Account Settings.

sfhowes - Changing "mail.smtpserver.smtp1.authMethod and change the value to 10" fixed it.

I sincerely appreciate your time in solving this issue. Thanks again.

I have exactly the same problem described by steve.hageman above. sfhowes's proposed solution by changing "mail.smtpserver.smtp1.authMethod" value to 10 did not work for me. The OAuth2 option still does not appear on the dropdown list for outgoing server authentication method. My outgoing server is Outlook.com (Microsoft).

I have exactly the same problem described by steve.hageman above. sfhowes's proposed solution by changing "mail.smtpserver.smtp1.authMethod" value to 10 did not work for me. The OAuth2 option still does not appear on the dropdown list for outgoing server authentication method. My outgoing server is Outlook.com (Microsoft).

See my first reply above for the correct server.

Hi sfhowes. Thanks for helping. The outgoing server name for my hotmail account is smtp-mail.outlook.com and has been for many years. I do not subscribe to Microsoft Office 365, so I am pretty sure smtp.office365.com would not be correct for my account.

Hi sfhowes -

thanks for helping everyone, but I still seem to not be getting the solution to work. I am trying to follow your instructions without success. I go to Settings > General and then I've tried to search for "mail.smtpserver.smtp1.authMethod" as well as the 2 and 3 variations, all without it finding anything. So apparently I'm missing something; I'm guessing I'm misunderstanding the directions.

FYI, I have a Hotmail account, the server type is POP Mailer Server, and the server name is pop-mail.outlook.com if any of that info makes a difference.