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Microsoft announced that its plans to drop support for Transport Layer Security (TLS) protocols 1.0 and 1.1 in its browsers will get delayed by a few months until the second half of this year.

All browser makers are dropping such support, or have already dropped such support, for those security protocols, favoring the use of TLS 1.2 or higher instead. Microsoft had previously indicated, back in October 2018, that TLS 1.0 and 1.1 support would be removed from its Microsoft Edge and Internet Explorer 11 browsers “in the first half of 2020.”

Browser Support Now Ends 2H
That 1H 2020 deadline has been pushed out a bit due to “current global circumstances,” per the announcement, which likely refers to the coronavirus pandemic. Here’s the new schedule on removing such support for this year.

The Chromium-based Edge browser will lose TLS 1.0 and 1.1 support around July:

For the new Microsoft Edge (based on Chromium), TLS 1.0 and 1.1 are currently planned to be disabled by default no sooner than Microsoft Edge version 84 (currently planned for July 2020).

Other Microsoft browsers will lose TLS 1.0 and 1.1 support around September:

For all supported versions of Internet Explorer 11 and Microsoft Edge Legacy (EdgeHTML-based), TLS 1.0 and TLS 1.1 will be disabled by default as of September 8, 2020.

Office 365 Support Ends in June
Microsoft had an even more aggressive timeline for removing TLS 1.0 and 1.1 support from Office 365 services, but it later backed off from that push, as described in an October 2018 announcement.

A revised Microsoft document (dated March 30, 2020) now indicates that “Microsoft plans to deprecate Transport Layer Security (TLS) versions 1.0 and 1.1 in Office 365 and Office 365 GCC [Government Community Cloud] as of June 2020.”

Microsoft is recommending the use of TLS 1.2 or later for “all client-server and browser-server combinations” when connecting to Office 365 services. However, Microsoft’s document described cases where certain older clients can’t use TLS 1.2 and should be updated.

Users of Microsoft Teams Rooms conferencing appliances should have “app version 4.0.64.0 or later installed,” the document recommended.

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