Symptom
MySQL is not installed by Mac OS X Server 10.0.
Solution
MySQL was omitted from the initial version (10.0.3). The 10.0.4 Server Update includes MySQL. Before installing the 10.0.4 Server Update, your server computer must be updated to Mac OS X 10.0.4. You may download these updates by visiting Apple Software Downloads (
http://www.apple.com/swupdates/).