I have a multiserver setup with panel, web, mailserver, webmailserver (I don't use DNS inside ISPConfig). All setup with the AI-script. Serveral customers want to get activesync for there smartphones / tablets. Is there a recommendation how to get this running? I found a lot of older tutorials some referring to kolab and some zu z-push (I assume kolab is using z-push). I don't like to insall kolab besides roundcube just to get activesync. So z-push seams to be the best solution. Has anyone implemented this? Or is there any better solution?