Microsoft packed the three hours of Wednesday's Build 2014 event with announcements for Windows 8.1, Windows Phone 8.1 and even the Xbox platform. Although all of Microsoft’s platforms have news of their own, the biggest focus was on the mobile one: Windows Phone 8.1. The software update starts rolling out to consumers in the next few months although new Windows Phone 8.1 devices should be launching in late April or early May. As expected, the update will add a new Action Center: Just pull down from the top of the screen to see app notifications and quick access to important settings. You can also customize the background image of the Windows Phone 8.1 home screen. Not all new features are visual, however. Windows Phone 8.1 now has Cortana, a natural language processing personal assistant.