Open XML for SAP is a product that allows users to create and manipulate MS-Office documents directly from SAP without needing to use separate interfaces or have MS-Office installed. It uses an innovative server-side approach where SAP handles Office documents using Open XML standards and templates created in MS-Office can be customized and have data from SAP bound to them. This provides benefits like WYSIWYG template creation, no need for interfaces between SAP and Office, and mass processing of document generation and manipulation directly from SAP.