Hello, today Microsoft sent out information to me email regarding this. No more access to old systems, action needed and known issue. It's horrible, I even had problems logging in to reply here. Here is the link to Microsofts message today:
"The safety and security of your information is top priority for Microsoft. To help keep your account secure, Microsoft will no longer support the use of third-party email and calendar apps which ask you to sign in with only your Microsoft Account username and password. To keep you safe you will need to use a mail or calendar app which supports Microsoft’s modern authentication methods. If you do not act, your third-party email apps will no longer be able to access your Outlook.com, Hotmail or Live.com email address on September 16th.
So, no modern authentication no mail!
Here is a long explanation.
https://go.microsoft.com/fwlink/?linkid=2274260