Taken from : http://technet.microsoft.com/en-us/library/ff431687.aspx
Summary: Explains how to configure SharePoint 2013 to use Office Web Apps.
This article picks up where Deploy Office Web Apps Server left off. In that article, you set up the server that runs Office Web Apps Server. In this one, you’ll configure SharePoint 2013 to use Office Web Apps Server. First, you’ll need to run a few Windows PowerShell cmdlets from SharePoint 2013, after which users will be able to open Office files from SharePoint 2013 document libraries in a browser.
If you’re not familiar with the features of Office Web Apps Server, check out the overview topic.
In this article:
- Before you configure SharePoint 2013 to use Office Web Apps Server
- Configure SharePoint 2013 to use Office Web Apps Server
- Troubleshoot errors in Office Web Apps when it is used with SharePoint 2013
- Disconnect SharePoint 2013 from Office Web Apps Server
- Install SharePoint 2013. See Install SharePoint 2013 for guidance.
- Make sure all SharePoint 2013 web applications use claims-based authentication. Office Web Apps rendering and editing won’t work on SharePoint 2013 web applications that use classic mode authentication. Learn more in SharePoint authentication requirements for Office Web Apps.
- To enable users to edit (not just read) Office documents in a web browser, you’ll need an editing license. Also, you’ll need to enable editing on the Office Web Apps Server farm. You can learn more about licensing requirements in Licensing Office Web Apps for editing Office files.
- If you log on to SharePoint 2013 by using the System Account, you won’t be able to test the connection between SharePoint 2013 and Office Web Apps Server. Log on with a different account to test the connection.
- Low memory conditions can cause Office document previews to fail in Office Web Apps. Review the article, Hardware requirements—web servers, application servers, and single server installations, for SharePoint 2013. These are the same requirements used by Office Web Apps Server.