It was only introduced last week, but Microsoft has announced over 12 million downloads of Office for iPad on their official Twitter account. The app is currently free for download, but doesn’t allow users to edit documents without an Office 365 subscription.
There is no way of telling if the downloads have translated into more subscriptions, but it does show that Microsoft is heading in the right direction. Notably, there is no mention of how the productivity suite is doing on the iPhone; which does allow editing of documents.
Critics were initially doubtful about Microsoft’s move to release Office for free on both Android and iOS, considering the move too little too late. Apple had already released their own productivity suite for free on new iOS devices with the launch of the iPhone 5S and 5C. It is likely that the MS Office downloads are coming from users who have yet to upgrade their Apple devices and are still looking for a productivity suite.