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iPhone OS 3.0: Meeting attendees may not appear to accept calendar events via Exchange account
When sending a meeting invitation (via an Exchange account) from an iPhone with iPhone OS 3.0 or later to someone using who uses an email application (such as Microsoft Outlook 2007) and a different Exchange Server than the sender, the recipient may accept the meeting invitation, yet appear to not be marked as having done so on the iPhone which sent the invitation. In other words, this issue is not likely to occur ........ read more http://ping.fm/3TKJ4