Dear, our situation is that we have a stack of a master-slave installation with 1 (obviously) master and 15-20 slave servers attached (everything updatest to the latest stable version of ISPConfig). The slave servers have different S.O. (some centos 6.5, some debian 7 and more recent debian). Now some of this slave servers are too much obsolete, and we want migrate the services hosted there in more recent one. We see that exist a script to do that: ISPConfig Migration Toolkit and looks promising. So what 's the best way to procede there? I think configure a new slave server with all the latest software, attach it on the master server, and then use the ISPConfig Migration Toolkit to migrate the services between the two servers. When terminated we can remove the old server from the stack. Is that correct? This carry on _all_ the services (web/mail/dns/ftp/backup...) from the previous to the new one? And what if we want migrate only certain services (eg. only certain domain) and not all of them? Thank you.