Security News > 2020 > July > Microsoft to Retire TLS 1.0/1.1 in Office 365 Starting October 15

Decades old, these protocol versions are considered obsolete, especially since the newer, safer TLS 1.2 and TLS 1.3 have been available for years.

In October 2018, Microsoft confirmed plans to remove support for the older protocols from its browsers, and also moved to deprecate TLS 1.0 and 1.1 for the Office 365 service.

"We temporarily halted deprecation enforcement of TLS 1.0 and 1.1 for commercial customers due to covid-19, but as supply chains have adjusted and certain countries open back up, we are resetting the TLS enforcement to start Oct 15, 2020," the company announced.

Windows 8 and newer include support for TLS 1.2, but Windows 7 devices require the KB 3140245 update to use the TLS 1.1 and 1.2 protocols, Microsoft also explains.

Microsoft is also moving forth with the deprecation of TLS 1.0 and 1.1 in Office 365 GCC, citing known vulnerabilities in the TLS 1.0 implementation.

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