I am running ZCS Network 7.1 and have just replaced my old named thawte cert with a digicert wildcard. Wasn't too hard, and it works well with the web interface. Unfortunately it is throwing an untrusted error in zimbra desktop. It is the correct cert, and strangely enough it is working fine in secured outlook connector. I have a heterogenous user base, so i expect to hear back from the mac users soon.
The user base is small enough that having the desktop users accept the cert is not a bad option, but i am wondering if anyone knows why this is happening. Is digicert not a trusted ca in zimbra desktop? It is a smaller certificate authority.