Daylite 3 Productivity Suite bundles Daylite 3 with Daylite Mail Integration Module (DMI 2.0).
Previous versions of Daylite and DMI had to be installed separately..

Another advantage to the Daylite 3 Productivity Suite is the license structure.
You only need to enter one license, which is applicable to both applications.
Whereas with previous versions, the license information also had to entered in separately.