Zarafa, the fastest growing commercial Linux-based groupware company in Europe, has benefited from the growing demand of organizations for integrated open source software. In the last four months dozens of software vendors and developers in open source projects have integrated or packaged software to Zarafa’s open source email and calendar solution. Some examples are SugarCRM, Alfresco, Ubuntu, Fedora and Univention. Integrated open source software enables organizations to achieve efficiency gains.