Microsoft announced Windows 10, the successor to Windows 8, last September. Like I’ve done in the past with Windows 7 and Windows 8, I downloaded the first tech preview in October and installed it on a spare laptop at work to get a jump on learning my way around the newest iteration of Windows. Last week, after an official media event for Windows 10 (at which Microsoft also announced HoloLens!), another big update to the tech preview was released so I grabbed the ISO and did a fresh install on my (original) Surface Pro tablet.