Systems and methods for data synchronization are described. In some embodiments, a method is devised for a client to synchronize information with a server. This client receives a communication from a server to selectively synchronize information between the server and the client, the information includes data that have never been synchronized with the client and change operations that have not been synchronized in last data synchronization, wherein the data is arranged and received in an order from higher priority to lower priority. The client stores at least a portion of the data and at least a portion of the change operations in memory of the client in accordance to order received and enables a user of the client device to have immediate access to the portion of data and the portion of change operations in the communication that are stored on the client at any termination point of information synchronization.