Microsoft's Groove apps for iOS and Android weren't quite as good as the Windows version, but this update was designed to change that. The company has given its music apps for both platforms a facelift that makes them look more like their Windows counterpart. It also bundled a handful of new features with it. The apps now have an Explore view listing the most popular songs, and they now take on a higher resolution when scaled up on big phones. Microsoft also promises faster downloads for offline playbacks and various improvements.By the way, don't be alarmed if your app starts rebuilding your collection from scratch after installing the update. Microsoft support engineer Ellen Kilbourne says the changes are so big, their database "must be rebuilt in order to move forward." It will only take a minute or two anyway -- you can start using Groove as usual after it's done.