My understanding of the reason why current MfE doesn't work with Google is that Google uses a relatively slapdash implementation of the version of ActiveSync that was used in Exchange 2003. While updating MfE to speak the protocol used in 2010, something broke with Google, yet it still works with older versions of Exchange. Given that Exchange is the standard, I'd say it's up to Google to fix whatever is broken on their end. That's not to say that it wouldn't be wise for Nokia to fix the problem on their end, but ultimately the responsibility lies with Google.
If MfE failed to work with Zimbra, I would similarly expect Zimbra to fix it.
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