Thanks for your feedback. Well... I think I will stay on UddeIM for now, because it is not very user-friendly to have no option to select the usernames from a list or have some sort of autocomplete as in UddeIM. I understand that you surely spent much time in developing a complete new PM system built into Community builder. But at the moment it is very basic and - compared to UddeIM - it lacks some essential features.
I think my users will tar and feather me when I migrate from UddeIM to the built-in system
Thanks anyway, keep up the good work!
Tom