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I tried uninstalling Zimbra and completely deleting the profile. I re-installed the connector and after all syncing was done, Outlook still copies me on the reply-all emails.
I'm not so sure it has anything to do with ZCO. You don't have a rule that is adding it, do you? Probably not, but just asking. I also found this post:
That is what I did. I installed an addon from Sperry Software which removes pre-defined email addresses when doing a reply to all. Works great and at a cost of $15 bearable too.