Mail Vacuum 1.1

Function: Optimizes the Apple Mail database, drastically improving performance (your mileage may vary). Quits and relaunches Mail during execution.
Author: Automator World
Notes: This workflow is based on a discussion at Hawk Wings. This workflow is probably best used as an iCal plug in, set to run once a month or so:

1. Open the workflow in Automator, and go to File > Save As Plug-in…
2. Choose iCal Alarm from the pop-up. iCal will launch, placing the workflow on today’s calendar box.
3. Select the Repeat pop-up from the day’s info window, picking the frequency desired (once a month is probably fine). Also set a time of day it won’t be obtrusive, like 2am.

.1 update: no longer requires separate “Quit” action.