Microsoft has released a new product “Office Online Server” on May 3 2016 during “Future of SharePoint” event in San Francisco.

Office Online Server is a new product by Microsoft allowing you to experience the same features as the cloud service Office 365 for onpremise environments.

For further information in English, kindly see the original article by the Office 365 development team here: https://blogs.office.com/2016/05/04/office-online-server-now-available/