So after locating the missing libraries from /usr/lib in my test VM, I copied them over to the production box. The SOGo service now starts, but the web interface is still inaccessible. However, instead of an http 503 error, it simply does not load at all.
SOGo logs says: sogod[10559] Cannot load adaptor bundle 'MySQL'
So SOGo is not talking to the database correctly? There is no good error message telling me what to do next.
I removed and re-installed the webmail module again, with no success.
Any suggestions?