Installing Office Web Apps for SharePoint 2010

Deploy Office Web Apps

http://technet.microsoft.com/en-us/library/ff431687.aspx

Installing Office Web Apps for SharePoint 2010

http://sharepointgeorge.com/2010/installing-office-web-apps-for-sharepoint-2010/

Word Web App cannot open this document for viewing because of an unexpected error. To view this document, open it in Microsoft Word

http://yaohany.wordpress.com/2010/09/22/word-web-app-cannot-open-this-document-for-viewing-because-of-an-unexpected-error-to-view-this-document-open-it-in-microsoft-word/