As indicated in a previous post, we are making changes to WSUS 4.0 and later that will provide a smoother Windows 10 servicing experience. Because WSUS 3.0 SP2 is already in extended support (receiving no support at all after July 2017), and we are not shipping these improvements further down-level, it is a good idea to start planning your WSUS migration now. Here is some guidance on how to respond to the recent changes based on your current situation, with the assumption that you intend to deploy Windows 10 in your environment.
Source : WSUS Product Team Blog
