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Transport Layer Security (TLS) Deprecation Guidance

Microsoft will start removing access within O365 and Exchange Online for connectivity using TLS versions 1.0 and 1.1 on 15 October 2020. This means any clients, devices, or services that connect to Office 365 through TLS 1.0 or 1.1 will stop working.

To ensure that there is no impact, all client machines and applications using NHSmail must support TLS 1.2.

Important Note

If you are using TLS 1.0 or 1.1 and do not follow this guidance, there will be an impact to NHSmail and services connecting through 0365 will stop working.

What are we asking you to do?

It is important that you carry out a review of your organisation’s use of TLS and upgrade to supported versions where appropriate. The links to external resources below will support you in your review.

Guidance and resources

Updated on 12/10/2020

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