If you are upgrading, it is especially important to note that the upgrade process may require a specific path. Very old versions of the firmware may not be supported by the configuration upgrade scripts that are used by the newest firmware. As a result, you may need to upgrade to an intermediate version of the firmware first, before upgrading to your intended version. Upgrade paths are described in the Release Notes.

Before upgrading the firmware of the FortiMail unit, for the most current upgrade information, review the Release Notes for the new firmware version. Release Notes are available from http://support.fortinet.com when downloading the firmware image file.

Release Notes may contain late-breaking information that was not available at the time this Administration Guide was prepared.