I'm looking for a solution that allows users of our SAAS webapp to edit their uploaded Microsoft Word documents within our webapp.<p>Dropbox seems to have achieved this by integrating with Microsoft Office Online [1]. However, it isn't clear to me whether Microsoft supports this for any old SAAS app, or whether it's only for internal business use-cases where each user has an Office365 subscription.<p>Has anyone achieved this integration with their webapp? Alternatively, are there any other SAAS integrations that would allow users to edit their uploaded Word docs online?<p>[1] http://wopi.readthedocs.io/en/latest/index.html