Windows 10

When Microsoft unveiled Windows 10 in 2015, it delivered an elegant operating system that could -- for the first time -- fulfill the potential of each modern computing form factor. Equally proficient on a touchscreen tablet, laptop, or conventional desktop PC, Windows 10 resuscitated the operating system's best features while setting the stage for Microsoft's ongoing innovation streak that includes idiosyncratic products like the Surface Pro 4, Surface Book and, more recently, the Surface Studio -- a desktop PC for artists and designers in need of high-end horsepower and display -- and the Surface Dial, a touch-friendly dial designed to facilitate fine contextual controls.

The next generation of the popular Surface tablet, the rumored Surface Pro 5, is expected to appear in the spring of 2017 -- timing that may coincide with the rollout of the next version of Windows, a free update scheduled for the first half of 2017. Windows "Creators Update" will introduce 4K video game streaming and support "augmented reality," bringing 3D capabilities to legacy applications such as Paint and PowerPoint. It will support 3D rendering for Microsoft's HoloLens technology, which will be incorporated into forthcoming devices from Acer, Lenovo, Dell, HP and Asus. And it will enable a virtual touchpad that lets you control external monitors from tablets, without need for a mouse.

It's worth mentioning that Apple delivered its own operating system overhaul in September 2016. MacOS Sierra added some new features inspired by its own mobile operating system. And though Apple clearly wishes to continue the integration of Macs and iOS products, providing additional incentives to keep your hardware inside Apple's walled garden, it's not always a perfect fit. In fact, the new MacBooks announced in early October 2016, equipped only with USB-C ports, can't connect to the new iPhone 7 and its Lightning Connector, without an adapter.

Windows 10 is the Goldilocks version of Microsoft's venerable PC operating system -- a "just right" compromise between the familiar dependability of Windows 7, and the forward-looking touchscreen vision of Windows 8.

This new Windows, available as a free upgrade for existing Windows 7 and Windows 8 noncorporate users, is built from the ground up to pursue Microsoft's vision of a unified OS that spans all devices without alienating any one platform. It's an attempt to safeguard Microsoft's crumbling software hegemony, assailed on all sides by Google and Apple. And it's a vision of the future as Microsoft sees it, where a single user experience spans every piece of technology we touch. Welcome to Windows as a service.

Yes, this new OS is chock-full of fresh features. To name just a few: a lean, fast Internet Explorer replacement called Edge; Microsoft's Siri-like voice-controlled virtual assistant, Cortana; and the ability to stream real-time games to your desktop from an Xbox One in another room. (And in case you're wondering: there is no "Windows 9" -- Microsoft skipped it, going straight from 8 to 10.)

But Windows 10 is also the end of a long, awkward road that began with the release of Windows 8 in 2012, when Microsoft tried to convince a world of keyboard and mouse wielders that touchscreens were the way to go -- or else. Ironically, in 2015, the PC hardware for that touchscreen future is now here -- everything from 2-in-1s such as the Lenovo Yoga line to convertible tablets with detachable keyboards, like Microsoft's own Surface. And Windows 10 smoothly lets users transition from "tablet" to "PC" mode on such devices like never before.

For the rest of the PC universe -- including those who still prefer good old-fashioned keyboard and mouse navigation -- Windows 10 is a welcome return to form. The Start menu, inexplicably yanked from 8, is back and working the way you expect it to. Those live tiles from the Windows 8 home screen still exist, but they've been attached to the Start menu, where they make a lot more sense. And the fiendishly hidden Charms bar has been morphed into the more straightforward (and easier to find) Action Center.

As always, there are some quibbles and gripes with the end product, but all-in-all -- after living with Windows 10 for months -- I can say it's a winner. It's flexible, adaptable and customizable. And it's been battle-tested by an army of beta testers for the better part of a year, making it one of the most robust operating system rollouts in recent memory.