We chose Apose.Total as the most effective library to render non-XML format (doc, xls, ppt) Microsoft Office documents into their XMLl form (docx, xlsx, pptx). We highly recommend Aspose.Total for reliability, features and support. Aspose.Total provides us with unparalleled capabilities for processing, rendering and converting Microsoft Office documents to and from XML. XML forms the backbone of our data architecture so having a library that can convert, render and create XML based Microsoft Office documents is highly important. We can totally recommend Aspose.Total as a Microsoft Office document handling and processing solution.