Hi schrambo,
I've decided to try the 6.01-01custom ISO - currently downloading... up to about 80% with 5 hours to go

Yeah pretty much every time I download an ISO, a new one is released a week later

but in this case, even though I hear there's a new one due soon, this server needs to be back up by tomorrow morning, so I can't really wait any longer and this custom ISO seemed to have a lot of features that would come in handy (without having to manually add the contribs)
My main concern was whether there were any security issues that needed updates on any of these releases - but I'm guessing if there were, they'd be mentioned somewhere on this site and I haven't been able to find any so... hopefully I can just install the Custom ISO and have no more rootkits installed

but this time I'll keep it updated when any newer versions are available. (I *stupidly* was too busy to keep my 5.5 server up to date)
Though I hear there won't be anymore from MITEL - apparently 6.0.0 is the last one from them... it's now up to the opensource community to keep it going.
Anyway, I'd better get back to work.
Thanks for the reply,
Ingo.