Thanks for the 'HowTo'. It was a great relief to switch back to Roundcube from SquirrelMail. Its all going swimmingly well.My only concern is the 'Howto' is for version 1.1.3. Is it safe to upgrade to later versions since (I think) 1.1.7 sorts a security bug?
I managed to get the latest version of roundcube (1.3) working on ISPconfig 3.1.6 No big gotcha's that I recall although I did run into the soap errors again. About to do it a second time and if I have the time ill try to document what I did to resolve those this time around. I looked up here before I did 1.3 last time and saw this posting and meant to comment then but forgot after I was completed. Figured this time I'd at least comment before I do this again for anyone else as its only been 8+ months since you asked and nobody responded.