Thanks for your reply.
I will mark this as solved, seeing as it seems to be a known issue. It's not a show stopper for me, just something I needed to confirm so I can plan my implementation accordingly.
So far it's been smooth sailing for me.
Upgraded from 5.0.5 Community Edition to 5.0.5 ZCS NE, backed up, moved it off the VM it lived on for the last two years and onto it's own SUN x4100, upgraded to 5.0.6 and installed a Win3k server with Blackberry Professional (the 10 seat thing for SME users) in a VM and successfully activated a device.
All this in less than two working days, none of which would have been possible without people like yourself who participate in this forum and the Zimbra Wiki.
My BES implementation is still a bit unpolished. As a BES newbie there's still lots to learn with regards to security policies and all the crazy stuff you can do over the air but all the Zimbra bits and pieces "just worked".