I'm wondering why you picked SOGo over ownCloud, ownCloud offers many more services, runs entirely on PHP with a single CRON Job and allows custom plugins so you could even fit stuff like some per-user configuration options within a custom plugin, options like Greylist OptIn etc. Most importantly it can use IMAP Authentication so it's very plug and play. I'd be willing to write an ownCloud Integration guide for your Docs if you'd like as I'm gonna be removing SOGo and installing ownCloud, not only does it look much much nicer, its Database formatting is usable in 3rd party applications and to go along with it I'll install PHP-Push2 instead of the broken ActiveSync in SOGo.

I guess I'm asking for a quickfire guide to remove SOGo from stock install with iRed.