Email system including synchronization server(s) providing synchronization based upon synchronization indicators stored on mobile devices and related methods

摘要

An email system may include an email server(s) configured to store email messages in a plurality of mailboxes, and a plurality of mobile wireless communications devices each configured to store email messages and an email synchronization indicator for a respective mailbox. The system may further include an email synchronization server(s) configured to establish synchronization sessions with the mobile wireless communications devices and retrieve the email synchronization indicators therefrom, and determine changes to the mailboxes and synchronize respective email messages between the mobile wireless communications devices and the email server(s) during the synchronization sessions based upon the retrieved email synchronization indicators. The email synchronization server(s) may also be configured to communicate updated email synchronization indicators to the mobile wireless communications devices, and terminate the synchronization sessions without storing of the updated email synchronization indicators at the email synchronization server(s).