iOS and Android users may see a mobile version of Microsoft Office designed for their devices soon. Microsoft has confirmed the existence of the product but has kept mum about a specific launch date and other details.
As you already know Microsoft account will be the key for using the Office app. Your Microsoft account will provide access to the basic viewing functionality. In order to get the edit facility, you need to subscribe to Office 365(not free) which can be done from within the apps. Mobile Office will support Microsoft Word, Powerpoint, and Excel documents.
Last month, it was rumored that Microsoft is planning to release Mobile Office for iOS and Android, with a consumer launch scheduled for the end of February 2013. But Microsoft later clarified that this information was not accurate. However now there is no doubt about Office supporting iOS and Android because the company spokesperson recently commented that “Office will work across Windows Phone, iOS, and Android”
Do note that the mobile version cannot replace your Office in your desktop or laptop as the in-app editing will be just basic in functionality.