1. A non-transitory computer-readable storage medium having stored thereon a plurality of instructions which, when executed by a processor, cause the processor to perform the steps of a method for assessing a data object present on a mobile communication device, the assessment provided by a server computer, the method comprising: before receiving data identifying at least a portion of the data object present on the mobile communication device at the server computer, determining if previously stored definition information stored in a local store at the mobile communication device corresponds to the data identifying at least a portion of the data object present on the mobile communication device, the local store storing a corresponding assessment for the previously stored definition information; and, if the previously stored definition information in the local store at the mobile communication device does not correspond to the data identifying at least a portion of the data object present on the mobile communication device, then at the server computer, receiving data identifying at least a portion of the data object present on the mobile communication device; at the server, determining if previously stored definition information for a data object corresponds to the received data, the definition information stored in a data store accessible by the server, the data store storing a corresponding assessment for the definition information; if the previously stored definition information corresponds to the received data from the mobile communication device, then at the server, providing the assessment of the data object present on the mobile communication device corresponding to the previously stored definition information.