Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. SOGo (formerly named Scalable OpenGroupware.org) is an Open Source collaborative software (groupware) server for multiple clients. It is mostly written in Objective C and uses PostgreSQL and Apache. OpenGroupware.org is built on code released in 2003 by SKYRIX Software AG, it represents a product that has been under development since 1996. OpenGroupware.org differs from many other groupware offerings in that it is not only a suite of bundled collaboration applications but focuses on providing a platform for groupware solutions through the use of standard protocols and XML based APIs. Accordingly projects to support clients such as Kontact and Novell Evolution via GroupDAV, are either complete or underway. Synchronization of mobile devices is supported via BionicMessages' GroupDAV connector for the Funambol DS server. The zOGI XML-RPC API enables easy integration with existing custom applications. OpenGroupware.org has been used as groupware platform to build CRM and scheduling solutions in conjunction with other Open Source software including LAMP and Mono.