Group and team work represents an efficient form of collaboration within companies and across company boundaries. Increasingly, this form of collaboration is supported by software that transcends spatial and temporal distances. The software designed to facilitate collaboration within a group is referred to as groupware. The groupware market is currently dominated by two main providers: Microsoft Exchange with Outlook and IBM with Lotus Notes/Domino are the leading suppliers. The efforts of other groupware application providers primarily focus on the server component. Typically, standard clients like Microsoft Outlook can be connected to these solutions. This allows companies to save money on the server side without having to struggle with user acceptance on the client side. According to a Berlecon study from 2006, Communiga is particularly noteworthy.