A method for coordinating messages between an internal e-mail account and an external e-mail account is described comprising: retrieving specified e-mail messages from the external e-mail account and storing the messages in the internal e-mail account; mapping internal identification ("ID") codes assigned to the e-mail messages by the internal e-mail account to external ID codes assigned to the e-mail messages by the external e-mail account; detecting that an operation has been performed on a particular e-mail message on the internal account; determining an external ID code for the particular message based on the mapping; and transmitting an update to update the external account, the update including the external ID code to identify the particular e-mail message and an indication of the operation performed in the internal account.