Microsoft to make TLS 1.2 in Office 365 mandatory

Simplex Solutions - TLS SupportIn support of Microsoft’s promise to provide ‘best-in-class’ encryption to its customers, they are planning to discontinue support for Transport Layer Security (TLS) versions 1.0 and 1.1 soon in Microsoft Office 365.

As of October 31, 2018, Microsoft Office 365 will remove support for TLS 1.0 and 1.1. This means that if you have issues connecting to Office 365 services because of weaker protocols, no support tickets would be generated.Microsoft


What is TLS?

Transport Layer Security (TLS) is a network service which aims to ensure secure communications between devices over the internet. TLS has been through a number of revisions over the years and now the recommended version is TLS 1.2.


By October 31, 2018, all client-server and browser-server combinations should use TLS version 1.2 (or a later version) to ensure connection without issues to Office 365 services. This may require updates to certain client-server and browser-server combinations.

If you do not update to TLS version 1.2 (or later) by October 31, 2018, you may experience issues when connecting to Office 365. If you experience an issue related to the use of an old TLS version after October 31, 2018, you will be required to update to TLS 1.2 as part of the resolution.

These changes will deem the affected services unusable due to a lack of support for the TLS 1.2 protocol:

  • Android 4.3 and earlier versions
  • Firefox version 5.0 and earlier versions
  • Internet Explorer 8-10 on Windows 7 and earlier versions
  • Internet Explorer 10 on Win Phone 8.0
  • Safari 6.0.4/OS X10.8.4 and earlier versions

Whilst the end of support might come to a shock to some device users, there have already been multiple changes to common websites and services which have already resulted in a drop in support for older versions of TLS. It is widely advised by the IT security community that if you are using a device which does not support TLS version 1.2, you should be actively looking to migrate to ensure your data’s security.


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