There are innumerable calendar apps in Google Play, but one of the real standouts is Sunrise Calendar. This app has a clean interface, a solid widget, and support for plugins. However, it only worked with Google and iCloud accounts at launch. Now you can add Exchange to that list.
Sunrise says this was the most requested feature for the app, and it's no surprise. By and large, if a business isn't using Google Apps, it uses Exchange. Now that Sunrise supports Exchange, you can plug your work account in and get all your scheduling whatnot done in a much nicer interface. It's free, so check it out.