Microsoft Defender for Endpoint on Mac is retiring support of macOS High Sierra [10.13]

Note: this message applies only to organizations with macOS devices in their environments.

Beginning February 15, 2021, Microsoft Defender for Endpoint (formerly known as MDATP) will no longer support macOS version High Sierra (10.13). Apple ended support for High Sierra (10.13) in November 2020.

Key Points:

• Timing: February 15, 2021
• Action: ensure macOS devices that are still running macOS High Sierra (10.13) are updated to a more recent macOS version.

How this will affect your organization:

On February 15, 2021, if your environment still has macOS devices running macOS version High Sierra (10.13), any macOS High Sierra machine running Microsoft Defender for Endpoint (Mac) will remain protected until the agent expiration, however it will fail to update (error will be logged in /Library/Logs/Microsoft/autoupdate.log).

What you need to do to prepare:

To eliminate risk of losing protection, update all macOS devices in your environment to a macOS version newer than macOS High Sierra (10.13) by February 15, 2021.

Microsoft Defender for Endpoint (MDE) on Mac currently supports macOS versions Big Sur 11, Catalina 10.15, and Mojave 10.14.

Refer to MDE (Mac) public documentation for list of system requirements: Microsoft Defender for Endpoint for Mac – System Requirements

Monitor “what’s new on Mac” page for incremental changes across versions of MDE (Mac): What’s new in Microsoft Defender for Endpoint for Mac