An Update on Office 365 Requiring TLS 1.2


Hello Exchange Server followers! In December 2017 it was announced Office 365 planned to discontinue support for TLS 1.0 and TLS 1.1 connections on March 1st, 2018, and after that time only TLS 1.2 connections would be allowed when interacting with Office 365.

Many of you have been asking for additional detail on what this meant for on-premises deployments in hybrid mode or what happens if you do business with customers whom use Office 365 as their collaboration platform.

We would like to bring to your attention an update on Office 365’s plans to enforce TLS 1.2, which has now been communicated in this KB article (KB4057306). The end of support for TLS 1.0 and TLS 1.1 has been moved from March 1st, 2018, to October 31st, 2018 to allow for more time to prepare.

Though this date has been pushed back a bit, we will continue our Exchange Server TLS guidance blog post series soon. We also ask that you continue your preparations for this change, so you are in a position to not be impacted upon its completion.

The Exchange Team

Comments (2)
  1. Gustavmk says:

    Hello,

    Can you inform if another SO platforms as Windows XP or below will be affect with this change? I’m searching for this information, because they won’t have support for TLS 1.2.

    Regards

  2. Hi Team,

    We have mixed environment of Windows 7 & 10 Clients with ADFS & O365 Platform used for Exchange Online, Skype Online and One-drive & On-Premises SharePoint infra .

    Users globally Uses IE/Chrome browser for all browsing above application with Global GPO settings enabled as “Turn off encryption support” of browser negotiates or does not negotiate an encryption tunnel by using the encryption methods such as Transport Layer Security (TLS) 1.0, TLS 1.1, TLS 1.2, Secure Sockets Layer (SSL) 2.0, or SSL 3.0.

    Now, we are planning to Use the resiliency Update of TLS1.2 to all Win 7 & 10 clients and want to understand the risk & Impact and appropriate procedure for implementing this security change.

    And also please share the procedure how to generate the existing settings available on O365/ADFS infra and backup procedure for rollback scenario.

    Kindly share requested information, which would be grateful for further go!

    Regards, Ramesh Seshadri

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