Today’s the day. You can mark this one in your Outlook calendars – from October 31st 2018, TLS 1.0 is no longer supported in Office 365.
What does this mean? Well, if you’re using older versions of office, Lync Phone Edition handsets, or an older OS and you run into an issue connecting to the service, Office 365 support will no longer be able to help if the device does not support at least TLS 1.2
This does not mean that your older devices and programs will suddenly stop working. Microsoft has said:
“This doesn’t mean Office 365 will block TLS 1.0 and 1.1 connections. There is no official date for disabling or removing TLS 1.0 and 1.1 in the TLS service for customer connections. The eventual deprecation date will be determined by customer telemetry and is not yet known. After a decision is made, there will be an announcement six months in advance unless we become aware of a known compromise, in which case we may have to act in less than six months to protect customers who use the services.”
For further information on how to prepare your environment to support TLS 1.2, check out Microsoft’s helpful article: https://support.microsoft.com/en-au/help/4057306/preparing-for-tls-1-2-in-office-365
You can also read a previous post of mine on the subject: http://blog.chiffers.com/2018/10/02/one-month-until-tls-1-0-support-is-removed-from-office-365/