Synchronizing SMS Items

A client initiates synchronization of data with the server by sending a Sync command request to the server. The Sync command request synchronizes the client's data with the data currently stored by the server.  

When protocol version 14.0 is used, synchronization of SMS items is supported only for the Inbox folder, the Outbox folder, and the Sent Items folder. Protocol versions 14.1, 16.0 and 16.1 support synchronization of SMS items on any folder that contains email messages. Other protocol versions do not support synchronization of SMS items.

The Sync command request is further specified in [MS-ASCMD] section