Microsoft has officially The user interface seems very polished and has a desktop-esque look and feel most of us are familiar with. Surprisingly, Office Web Apps appears to work just fine in Chrome, Firefox and even Opera, though the "Edit in 'Office program'" button won't work unless you are in Internet Explorer. The platform will seamlessly integrate with Microsoft's Office 2010, which launches to the public next week, and will be compatible with smartphone versions of Office 2010.