(http://s9.postimg.org/kbalcanun/Windows-10-_Sets.png)
Microsoft today released Windows 10 Build 17618 (RS5) for Skip Ahead Insiders. This new Insider build brings back the Sets feature which was disabled in the past few builds.
Sets will be supported by 1st party experiences like Mail, Calendar, OneNote, MSN News, Windows and Microsoft Edge. In addition, Microsoft has also added support for some Win32 apps in Sets.
It includes File Explorer, Notepad, Command Prompt, and PowerShell. This build also includes several general improvements and bug fixes. Read about them here (http://www.windows10newsinfo.com/smf/index.php/topic,34621.0.html).
source (http://mspoweruser.com/microsoft-announces-windows-10-build-17618-rs5-for-skip-ahead-insiders/)