That's really the question.
I've noticed that a number of issues have been brought up, repeatedly, over time and there never seems to be a resolution nor is there any input indicating that the problem is acknowledged and that it is being worked on.
I really like the Zimbra Desktop client, but will be unable to keep using it if I have to keep cleaning up after hundreds of zdesktop error reports per day that "Google Address book synchronization failed."
This function isn't "an extra" for any e-mail client, but is a core function that really must work correctly. There are reports going back to last year, at least, on this error and not an inkling of whether or when it might be addressed. Does anyone know whether it's being looked at and, if so, when a patch/fix might be coming out?