Oceanwatcher,
I did what you're currently doing, that is to upgrade to eBox 1.5.
To make the story accurate, I also upgraded from Hardy to Lucid
Well, few expected detail like source.list to be updated but this aside, upgrades when rather fine.
I made the OS upgrade some weeks ago, before mail module was available and deployed my own postfix configuration.
Then I happily installed mail, webmail etc... modules once available and starting from this point I faced some problems.
But I believe we should discuss this in another thread, not in the announcement section isn't it?