Interesting discovery: I found that by unchecking "Contacts" before attempting a synchronization, the Z10 would, indeed, update the calendar! However, unchecking "Calendar" and checking "Contacts" always results in a failure to sync the contacts.
So....
Does anyone have an idea of what's happening here? I suppose it
could be a corruption somewhere in the Outlook Contacts file, but if so....how does one fix
that?