The new Office Online Server (OOS) – the successor to Office Web Apps Server 2013 – will receive regular feature updates to provide customers with the latest and greatest capabilities. As part of this change, customers will need an Office Suite with Software Assurance (SA) or an Office 365 ProPlus subscription to create, edit, or save files. Customers who purchased an on-premises Office 2016 suite through Volume Licensing prior to August 1, 2016 are exempt from the Software Assurance requirement. View-only rights will remain available to all customers without licensing restrictions.
Office Online Server will now maintain closer feature parity with the Office Online cloud service, bringing a variety of new features to the on-premises product. For example, real time co-authoring will now be enabled in Office Online Server. Going forward, most new features delivered to the Office Online cloud offering will become available in OOS.