I currently have ZCS 4.5.6 running on Ubuntu LTS and a Debian Etch machine that handles basically everything else. Linking Apache authentication to Zimbra was trivial and Jabber looks like it will be about the same, but Samba seems like it will be interesting.
The documentation in the wiki appears to be based primarily on starting from scratch, where I have ~10 users that access the Samba server and a total of around 20 Zimbra users. I need to know if I can integrate these users without a huge amount of pain. UNIX authentication is not really needed, just Samba so that my users can share the same authentication information for their e-mail and domain logins.