I haven't done it yet, but it *should* be really straightforward. I'd expect an in-place upgrade of Tomcat to work (make sure you have GOOD backups first though, just in case!). Failing that, I would attempt a side by side install of the new tomcat and move my content over, modifying the paths in alfresco-general.properties. Alfresco is really just a big WAR file that uses a database. As long as you stick it in a compatible container and point the configuration files at the right place, it should go…