Are you using IMAP on the iphone or is it set to an exchange connection?
Same question for Outlook, how is that connecting to Zimbra?
My suspicion is that IMAP is being used for both and the IMAP command for 'Accept this appointment' is being sent incorrectly, and all imap devices see that as a tentative accept, but the zimbra server and by extension, the web client, are listening for the incorrect response, and set the status to the expected accepted
Of course, this theory is useless if the iphone and outlook are using different protocols to connect.
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problam with iphon