Hiya, I had a similar problem when I went from my SL5500 (OZ32) to a C860 (Cacko 121b). Saw a post somewhere in here I think that said how to do it :-
Get datebook, addressbook and todo from and OZ/Opie feed.
Install them over the default apps that came with the Cacko ROM.
see multisync.sourceforge.net to download multisync and the plugins to sync with your Z.
This setup will allow you to sync between Evolution and the Z. I would have preferred Qtopia Desktop - but thats not an option at the moment.
NB : Setup a Z -> Backup sync as when I first set this thing up, I managed to wipe all the data from my Z.