Microsoft is moving all of their online services to Transport Layer Security (TLS) 1.2+ toprovide best-in-class encryption, and to ensure their service is more secure by default.
Key Points:
- Major: Retirement
- Timing: October 15, 2020
- Action: update or replace client devices as appropriate
How this affects your organization:
Once this change takes affect, all connections to Office 365 using the protocols TLS 1.0 and TLS 1.1 will no longer work.
What you should do to prepare:
Update or replace clients and devices that rely on TLS 1.0 and 1.1 to connect to Office 365, prior to October 15, 2020.
Additional information : https://docs.microsoft.com/en-us/microsoft-365/compliance/tls-1.0-and-1.1-deprecation-for-office-365?view=o365-worldwide