Is Windows 10 certified with ArcGIS Products?

Blog Post created by MSingleton-esristaff Employee on Sep 3, 2015
Update on January 14, 2016:

Windows 10 support begins at ArcGIS 10.3.1.

Other than the products currently certified, Esri recommends that you do not install Windows 10 for use with Esri products until testing and certification are complete.

ArcGIS Pro is not currently certified for production use on Windows 10, but we fully anticipate supporting Windows 10 for ArcGIS for Desktop 10.4 and ArcGIS Pro 1.2, which are scheduled for release in Q1 2016.

ArcGIS Runtime SDKs for .NET, Java, and Qt will be certified for the upcoming Quartz release in 2016. The Quartz release of the ArcGIS Runtime SDK for .NET will include a new API to build Universal Windows Platform (UWP) applications for Windows 10. ArcGIS Runtime SDKs version 10.2.6 and below will not be certified with Windows 10.

For additional information, please read the following:
We will continue to post updated information regarding Windows 10 support to this post, as well as to the technical article and System Requirements pages, when information becomes available.
Megan S. - Online Support Resources