A server system comprising a processor, memory including computer program code, the memory and the computer program code configured to, with the processor, cause the server system to harmonize metadata structure of a target server according to metadata structure of a source server by
- importing the metadata structure of the source server to the target server, wherein the metadata structure defines by means of structure elements semantics for a metadata, which metadata is associated with electronic objects being stored in said source server;
- mapping the structure elements to corresponding structure elements in the target server according to mapping rules, wherein similarity mapping is performed for referenced structure elements and identity mapping is performed for fully represented structure elements;
- and
- copying content elements, if available, containing at least electronic objects with associated metadata from the source server to the target server by applying the imported metadata structure.