Office 365 Retiring TLS1.0 & TLS1.1

To provide the best-in-class encryption to our customers, Microsoft plans to discontinue the support for Transport Layer Security (TLS) versions 1.0 and 1.1 in Office 365 as of June 2020.

The Microsoft TLS 1.0 implementation has no known security vulnerabilities but because of the potential for future protocol downgrade attacks and other TLS vulnerabilities, Microsoft are discontinuing support for TLS 1.0 and 1.1 in Office 365.

As of June 2020, Office 365 will begin deprecating TLS 1.0 and 1.1 in worldwide environments for commercial customers and non-profit customers. This means that starting in June 2020, any commercial and non-profit clients, devices or services that connect to Office 365 by using TLS 1.0 and 1.1 will not succeed.

We recommend that all client-server and browser-server combinations use TLS 1.2 (or a later version) to maintain connection to Office 365 services. If you have a multi-function printer that uses scan to e-mail to Office 365 then we highly recommend you get in contact with your printer support company to check if your currently device supports TLS1.2.

The following clients are known to be unable to use TLS 1.2. Update these clients to ensure uninterrupted access to the service:-

  • Android 4.3 and earlier versions.
  • Firefox version 5.0 and earlier versions.
  • Internet Explorer 8-10 on Windows 7 and earlier versions.
  • Safari 6.0.4/OS X10.8.4 and earlier versions.