Microsoft announced today that it will take Intel CPU microcode updates meant to fix the Spectre v2 vulnerability and ship these updates to users via a Windows update package. The announcement is a change of direction in regards to Microsoft’s position towards the Meltdown and Spectre patching process. Microsoft and Intel are working on other Windows updates for more microcode fixes, for other Windows versions and processor series. The update package is only available for Windows 10 version 1709 (Fall Creators Update) & Windows Server version 1708 (Server Core)
Source: https://www.bleepingcomputer.com/news/security/microsoft-partners-with-intel-to-deliver-cpu-microcode-fixes-via-windows-updates/