Just go it loaded up with on Gentoo with Evolution 2.12.3, I had to use .3 otherwise it wouldn't compile. I've created a small ebuild (nothing to it really) and I will go ahead and move it up to bugzilla.
If you decide to use SSL with SOAP, be sure to change the port to 443 (or the ssl port you setup on your server)
Seems to work, contact and calendar events sync up. I'm getting some errors on the IMAP connection one about UID store, and something else ... I'll create another thread on that since it should just be using IMAP and probably isn't related to evolution-zimbra.
Gentoo Bug 211208 - Zimbra Collaboration Suite Evolution Connector.
UPDATE :: The UID store error was a problem of zimbra, upgrading to 5.0.2 fixed it