Using classic Outlook for Windows in business environments
JaviHotmail - At this time we haven't fully announced the date that Basic Auth will be going away. We wanted to give an update to potentially allow users to have guidance on what they can do to quickly get themself back into a better state. The large majority of users that are leveraging pop/imap/eas are actually using clients that support OAuth. So they can make the configuration change and see less auth prompts.
Those that are on older version of Outlook, such as Outlook 2013 and Outlook 2016 (which have ended mainstream support) will be the ones that need to move towards a newer version that does support OAuth. Again we know this is often something users need to plan for so we wanted to get that guidance out in advance.
As we look to announce full deprecation timelines, we will ensure that it is timely enough that users just don't get blocked and there is ample opportunity to get upgraded.