I just thought I would post a note to say how "wonderful" the upgrade of scalix 10 went. I'm running the community edition on a centos 4 server. Ran the upgrade and in about 5 mins was running the new version with very little interaction on my part.
Our users here haven't even noticed any downtime.
now if I had read the release notes I wouldn't have spent the next 10 mins trying load SAC on port 8080 ;-)