Microsoft Office Mobile is a free office suite by Microsoft for mobile devices.Originally released as Pocket Office on Windows CE v1.0 Handheld PCs in 1996, the app in its present form is now available for tablet computers and smartphones running the Windows 10, Windows Phone, Android, and iOS mobile operating systems. It was previously available for Windows Mobile and Symbian.The core Office Mobile apps are Word, Excel, PowerPoint, and OneNote.