Kingsoft Office For Windows Phone
Kingsoft Office Free 2013 are available for currently for Windows 8, Android and IOS and Blackbarry OS and there are good market share in Mobile platform .
Companies may launch Office for windows 8.1 and there are relevant there Platform of Windows 8.1 and Windows Phone 8.1 it possible that Kingsoft make Office for windows phone
At currently Only Office 360 for windows phone available , microsoft not updated for major changes.