Microsoft unveiled a number of new changes for its Windows 8.1 update recently, but we've only seen them demonstrated in a small number of screenshots. Today the company revealed a new video demo of Windows 8.1, complete with some of the new features in the update. Start Screen changes, UI improvements, and the new Search interface can all be seen in the demo, and Microsoft also touches on the SkyDrive integration in Windows 8.1. Curiously, Microsoft still isn't showing off exactly how the Start button works in Windows 8.1, but if you're interested in the many changes that are coming later this year then it's a must watch.

Read this: Windows 8.1 preview: many small tweaks make for a significant update