System and method for pushing information from a host system to a mobile data communication device

A method of two-way synchronization between electronic mailboxes stored at a host system and a mobile communication device, each of the electronic mailboxes being organized into a set of hierarchical folders for storing received messages, the method comprising the steps of:

• coupling the mobile communication device to the host system;
• synchronizing the set of hierarchical folders at the host system with the set of hierarchical folders at the mobile communication device;
• retrieving a first list of messages from the host system and a second list of message from the mobile communication device, each list of messages including unique message IDs that identify the messages stored in the respective set of hierarchical folders on the host system and the mobile communication device;
• comparing the first list of messages to the second list of messages to identify messages having the same unique message ID and to determine whether the messages having the same unique message ID are stored in the same folders within the respective sets of hierarchical folders;
• if the messages having the same unique message IDs are stored in different folders within the respective sets of hierarchical folders then determining which message should be moved and moving that message so that the messages having the same unique message IDs arc stored in the same folders within the respective sets of hierarchical folders at the host system and the mobile communication device;
• de-coupling the mobile communication device and the host system;
• subsequently moving one of the messages at the mobile communication device so that it is stored in a different folder than the message having the same unique message ID at the host system;
• transmitting a move command message from the mobile communication device to the host system to indicate that the message has been moved, the move command message including the unique message ID of the moved message and an identification of the folder in which the message is presently stored at the mobile communication device;
• and
• moving the message corresponding to the unique message ID contained in the move command message at the host system so that it is stored in the same folder as the folder identified in the move command message.