Came across and issue during the deployment of Office Web Apps 2013 when hooking up with SharePoint which caused some confusion. Issue: Error messages from the web apps when activating through SharePoint documents: Word Document : “Sorry, there was a problem and we can’t open this document. If this happens again, try opening the document in Microsoft Word.” Excel Document: “We couldn’t find the file you wanted. It’s possible the file was renamed, moved or deleted”