By now, if you're in the "Fast" circle, your copy of Windows 10 Technical Preview should have upgraded to build 9879. While there are more than a few changes that Microsoft has described -- you can turn off the Search and Task View buttons on the taskbar, there are slicker animations, and a Notification Area that works -- some of the more interesting changes aren't part of the official party line.If you don't have build 9879 but want it (fair warning: for me, build 9860 was more stable), in build 9860, click or tap Start, PC settings. On the left, click Update and recovery, then click Preview builds. In the drop-down box on the right, choose Fast. Then click or tap Check now, followed by Install, and sit back and watch build 9879 perform an in-place upgrade.
To install one of the Enterprise versions of build 9879, download the ISO from the Windows Evaluations site
Windows Insider Hub hidden
The most important, largely undocumented, new feature in Windows10 build 9879 disguises itself as an app. To bring up the Windows Insider Hub, click Start, All Apps, Insider Hub. You'll see a cross between a website and an old-fashioned bulletin board, with lots of 9879 information, almost all of which is duplicated elsewhere. At the bottom, click the link and tell Microsoft what you think about build 9879. Then, below, take the three "missions" listed under We need your help.