In an aggressive move to compete with Microsoft, Google today made document editing software QuickOffice free for iOS and Android. The professional version of the software, which previously cost $19.99, allows users to edit Microsoft Office documents on their mobile devices.

Google bought QuickOffice in June 2012 for an undisclosed price, bringing the company a popular mobile productivity suite that integrates with Google Drive storage. As part of making QuickOffice free, anyone who logs in to a Google account from Android or iOS by Sept. 26th will get 10 GB of free extra storage in Drive for two years.

Quickoffice is available for Android and iOS.