After my last post on how to integrate Office Web Apps Server 2013 with Exchange Server 2013, I received several questions about how Office Web Apps Server would be licensed.
Unfortunately, TechNet doesn’t provide much information on this topic. The only reference I found is to be found on the following page, which describes the planning process for Office Web Apps with SharePoint 2013: http://technet.microsoft.com/en-us/library/ff431682(v=office.15)#license
Office Web Apps licensing offers two options:
View-only. By default, Office Web Apps is view-only. View-only functionality is provided for free.
Edit and view. You must purchase an editing license to use the editing features of Office Web Apps with SharePoint 2013. You enable editing when you create the Office Web Apps Server farm.
Based on this information, I would believe that Office Web Apps would be free for Exchange 2013 and Lync 2013 as both products only leverage the read-only capabilities of Office Web Apps.
To make sure, I cross-checked with the local Microsoft team and they (more-or-less) confirmed what I was thinking. Office Web Apps is a separate free-of-charge download that offers read-only capabilities for free.
As a side-note don’t forget that you will still need to license the OS of the machine from which you are running Office Web Apps 2013, this requirement hasn’t changed.