When Microsoft released the Windows 10 Technical Preview at the start of October, it promised that we'd get lots of rapid updates as it fixes bugs and rolls out new features -- and it wasn't lying! Yesterday, just three weeks after the initial Technical Preview release, Microsoft rolled out the first major update. There are three major new features in Windows 10 build 9841 -- a notification tray, Battery Sense, and Data Sense. In my eyes, though, the most important aspect was that it was really easy to install the new build; you just click a button. With Windows 10, has Microsoft finally tackled the abomination that is the Windows upgrade process?