This talk will introduce the secure, scalable and reliable groupware server Kolab. It is formed by a number of well-known and proven Free Software components and adds intelligent interaction between them. There's a web administration interface, management of free-busy lists and resources, synchronization for several devices and more. Various clients can access Kolab, among them Kontact (KDE) and Roundcube (Web). Best of all, Kolab is 100% Free Software, so you are free to use, study, share and improve it.