Windows and Office. Its a duo that has made up the core of Microsofts business since before I was born, and remains the cornerstone upon which the rest of the company is built. And so it has gone, for as long as I can remember: with each new version of Windows, a refreshed edition of Office to go along with it. This year, weve got Office 2013. Weve obviously had some experience with it in Windows RT form, and I spent a fair amount of time using the Office 15 Consumer Preview last year (in fact, I wrote my Masters thesis in Word 2013 Preview). In the grand scheme of things, its a pretty major change, with the biggest probably being the move towards a subscription-based model, though you can still buy Office in a traditional retail boxed edition with a standalone license. The interesting part is Office 365, which involves paying on a yearly basis for multi-device licensing and cloud storage. Its worth clarifying the naming scheme here: Office 2013 refers to the latest version of the Office suite, while Office 365 refers to a subscription service that provides Office 2013 applications. Its a pretty sleek system, with all of Microsofts cloud services leveraged to provide a seamless experience. Obviously, this isnt the first time were seeing cloud-based document storage and backup, but the SkyDrive integration in Office 365 is much deeper than weve seen in the past. How does it work in day-to-day use? Read on for our impressions.