I'm a bit confused. I've decided to retain Unite! for shared Contacts and Calendar only (until Google introduces something for these)... and removed my email address, for a return to BIS. That darn Unite Message folder is still on my BlackBerry however. Anyway to get rid of it (other than hiding it)?

Well... I took a chance and deleted the Unite [CMIME] Service Book. It removed the Unite! Message icon from my home screen and the contacts and calendar seem to still be working fine. Considering that I've never done that before (only read about it), I'm quite excited!

That is in fact the way to do it. Well done.