This has been an ongoing effort by Microsoft to increase the security of Microsoft 365 by relying on Modern Authentication protocols which are more secure than Basic Authentication.Īdditionally, Modern Authentication provides compliance and policy controls which allow you to manage your data. Microsoft is blocking older versions of Outlook (such as Outlook 20) because support for Basic Authentication is ending. if most of us have met the deadline, and the few remaining are on their way, then what’s there left to talk about? Modern Authentication.Īside from all the reasons Microsoft has given for its changes to Outlook for Windows, an important reason has to do with the move from Basic Authentication to Modern Authentication. For the few who have not, Microsoft has taken a very proactive approach with its Customer Support Team by reaching out to identified tenants still with heavy usage of Outlook 20 in an effort to help those last few meet the November 1st deadline. Microsoft has also indicated that since the end of 2020, they have seen a substantial drop in usage of the soon-to-be unsupported versions of Outlook for Windows. So, there has been ample warning as to the deadline.Īdditionally, many of the Office 365 customers we engage with are using Office 365 ProPlus, which is the subscription-based version of Office. And with the COVID-19 crisis impacting all of 20, Microsoft has also made updates and adjustments to this and other deadlines as to version requirement changes for several Microsoft services. Over the past few years, Microsoft has communicated detailed and helpful information as to this deadline. This is not breaking news for most IT professionals and system admins.

As of Novemonly Outlook 2013 Service Pack 1 (with latest fixes) and later versions will be able to connect to Microsoft 365 services.

And that means a fairly important Microsoft deadline will soon be upon us. While many of us are still holding onto summer, it is mid-September and Fall is just around the corner.

Outlook 2013 exchange online