I'm not very happy with the "edit user" (whatever it's called) part of sac:
first of all, adding a second email address (and possibly many more edits, haven't tried) is not possible when the user is logged on. Why on earth not? Basically meaning: you have to try 100s of times, or check when users are logged on or off, or force users to logoff to do something rather simple...
second thing is: you are only told that the user cannot be modified when you actually want to save the changes you made. Very annoying. Finding out that you loose all your work, after working on a user for a few minutes. Scalix KNOWS a user is logged on, why not simply disable user editing then..?
But of course: you should be able to edit (at least certain bits of) a user at all times. MS Exchange can...
Mourik Jan