15. The computer program product of claim 14 wherein the determination of the threshold value is based on a data storage capacity of the client.
14. A computer program product for use with a computer system having a server with a server database, the server database storing a plurality of documents accessible to a client, the computer program product comprising a non-transitory computer useable medium having embodied therein program code comprising: program code for calculating at the server database, for a plurality of times and a plurality of clients, a document score for each of the documents, each document score designating an importance relative to other documents of a respective one of the documents to a respective one of the clients at one of the times, each document score indicative of whether the document should be synchronized between the respective client and the server database, wherein calculating the document score includes determining whether a relationship exists between the respective one of the documents and another of the documents in the server database; program code for initiating a synchronization task at one of the clients, the synchronization task for updating documents in the client database to match documents in the server database, the synchronization task specifying a threshold value that indicates the document score value for a document to be synchronized, and identifying the server and the server database for synchronization; program code for sending from the identified server and server database to the client a list of server documents produced based upon a comparison of the threshold value to the document scores; and program code for sending from the client to the identified server a fetch list based upon the list of server documents; and program code for transmitting one of the documents in the server database to the client based on the fetch list.