Revision with unchanged content. Web 2.0 is a common term in the Internet field nowadays. Services like Youtube or MySpace, which stand for the Internet of the second generation, have attracted attention on the consumer market. The company market on the other hand has not been strongly influenced by the new trend. But Web 2.0 could also be used to improve enterprise information technology. Examples are Web 2.0 concepts, which increase the effectiveness of data handling or concepts, which provide new communication methods. Therefore the use of Web 2.0 concepts in an enterprise context seems worth considering. Claus-M. Menzel explains in this book how the Web 2.0 approach could be used in an enterprise context and why the adoption of Web 2.0 could be a benefit for companies. For this objective the essence of Web 2.0 will first be clarified, as well as why and how this concept is working. It will be deduced which Web 2.0 elements can be used within companies and how they need to be adjusted to be used there. Furthermore this book will introduce technologies and applications which can be used for the realisation of web 2.0 in companies and compare these with the common enterprise information technologies.