Abstract: A synchronization device such as a synchronization server or gateway device for synchronizing a client device with a remote database is provided. In one example, the synchronization devices comprises logic operable to receive a client message and a sequence number associated therewith, compare the received sequence number with a stored sequence number, and cause a response based on the comparison of the received sequence number and the stored sequence number. For example, the comparison of the sequence numbers may indicate the previous response to the client device was successfully received or needs to be resent. Further, the comparison of the sequence numbers may indicate that the client device has lost state (e.g., is out of sync with the database) and needs to refresh or perform a slow synchronization process with the database.

Abstract: A method, apparatus, and system for routing changes to information between a plurality of content nodes and a command memory of a content router. Content nodes may be user devices (such as mobile phones) and user accounts (such as email accounts). Content nodes may hold one or more content types such as email, contacts, tasks, events and library items. A command memory centralizes conflict detection, resolution and error handling within a content routing system.