The Synthesis server is a very configurable server which stores its data in a database. Contact data can be exchanged in vCard 2.1 and 3.0 format when using the default configuration, but due to how it is stored, several attributes used by Evolution get lost or modified. It might be possible to protect against loss of those attributes, by tuning the Synthesis server setup. More work would also be required to exchange calendar entries and tasks, because in the default configuration they are not accepted in the iCalendar 2.0 format of Evolution.