Microsoft is at Mobile World Congress today, and the company is announcing its first significant update to Windows 8.1. Microsofts Joe Belfiore, who is now responsible for phones, tablets, and PCs at the software maker, revealed the update is coming this spring and is largely focused at improving the experience for mouse and keyboard users. Several leaks of an update, known as Update 1, have shown these particular changes several times, and Belfiore is confirming that the update will include improvements like a title bar at the top of modern apps, and power / search buttons on the Windows 8.1 Start Screen. Microsoft says there will be easy launching and switching of apps via the Windows 8.1 taskbar, alongside new mouse UI for right-click and closing apps. Its clear this is largely designed for mouse and keyboard users, and Belfiore admits Microsoft has heard the complaints.