Hmm... I'm seeing that this is a somewhat old (6+ weeks) thread, and yet there's no response, no fix, no discussion (other than confirmation).
I can confirm that this is an issue, on an install of ebox 1.5 / Lucid Server box. I believe, tho I am not completely sure, that this has been an issue in previous versions as well. There seems to be NO WAY to sync system users and ebox users, or create ebox users with the same user info as system users that already exist.
I can, as well, confirm that this need, for some of us, does exist. Might it not be nice, to see an Import function, or some other way to sync system users with ebox users, automatically or manually, so as to not have to create separate user accounts for each (one on system, one on ebox)?