This paper shows the experiences of a law firm with adopting Wiki Webs for knowledge management and collaboration over the last two years. Wikis created a business advantage for the lawyers through better re-use of their know-how within the firm. In addition, external Wikis for clients created new revenue opportunities and higher client satisfaction. The law firm uses a very simple Wiki implementation that makes it very easy to establish new Wiki instances. For client collaboration the Wiki was secured and extended with a simple user management system.