Message center announcements, September 20-26, 2021 HCS COMPANY MICROSOFT SERVICES B.V. Major updates Exchange Online and Basic Auth – September 2021 Update Act by: October 22 MC286990 | September 23 - We're making some changes to improve the security of your tenant. We announced in 2019 we would be retiring Basic Authentication for legacy protocols, and in early 2021 we announced we would begin to retire Basic Authentication for protocols not being used in tenants, but not disable Basic Authentication for any in-use protocols until further notice. Today, we are announcing that we are restarting the program to end the use of Basic Auth in Exchange Online. Beginning October 1, 2022, we will... View more (Updated) Important updates are available for Microsoft To Do apps Act by: October 31 MC280287 | September 23 - Updated September 23, 2021: Reminder to update Microsoft To Do apps (Android, iOS, Windows and Mac) and Outlook apps(Android and iOS) to the latest available version befo