Microsoft, who has been trailing in the recent mobile arms race for a while, has been taking major steps to make up the gap recently, garnering attention for the  introduction of Cortana (a Siri / Google Now competitor) and the launch of Office for iPad, which we covered in detail. One move that might have slipped under the radar, however, is Microsoft making Office for Android free late last month. Prior to the change, Office for Android required an Office 365 Subscription (which, while free to students, is still a barrier for a lot of people), Microsoft's cloud service for Office documents.