1. A method for writing data to non-volatile memory on a handheld wireless communications device, the method comprising: writing data to a first volatile memory; writing at least some of the data to both a second volatile memory and a non-volatile memory; employing at least one of the first and second volatile memories as an e-mail buffer; and employing as the e-mail buffer an e-mail buffer having a high water mark, a low water mark, and a delete maximum level.