I ran the installer script to upgrade from 11.0.2 to 11.0.4 and first got an error and the scalix-DB wasn't upgraded. I ran omshut and tried the installer again. This time, I only had the option of upgrading Scalix-DB, and it upgraded fine. Then, when I went to start Scalix, I got an error: "Inconsistency found between version files in sys and lib" Based on this thread:
viewtopic.php?t=6575&highlight=inconsistency+sys+lib, I hacked the /var/opt/scalix/xx/s/sys/version file to match what omvers was reporting, and Scalix started OK. (I think this happened when I upgraded from 11.0.1 to 11.0.2 as well.) My only issue now, is that SWA and SAC are both still reporting themselves to be version 11.0.2.23. I can't tell if that's a glitch, intended, or if I'm not fully upgraded to 11.0.4 yet....