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Sorry, this is a little off topic for this forum, but nothing else seemed to match either.
I've noticed that with Mail.app, I can connect to Zimbra by setting it up as an IMAP account or an Exchange account. Is there any advantage to one over the other?
In the past I used the Exchange mode and used to not see a certain type of meeting request. Knowing it was Exchange Apple filtered things that were Exchange specific so I do not know how it will handle Zimbra but to be safe I would suggest IMAP.
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Mail.app: imap or exchange 
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