I've downloaded the .OVA version of the Zimbra appliance 3 different times, 3 different computers, and each time I cannot deploy on vSphere 5. I end up with an error that says "uNABLE TO ACCESS FILE: e:\ZCA-18.104.22.1686-412056-disk1.vmdk.gz. Unable to load DLL "zlib1.dll': The specified module could not be found".
I am able to import the appliance into vSphere 5 using the http location.
If you have any advice on getting around the error with the downloadable appliance, I'd appreciate it.