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I found these steps on the Apple site and modified them - the modifications work. open Calendar Calendar -> Accounts Disable exchange calendars Reboot Now re-enable open Calendar Calendar -> Accounts Enable exchange calendars
1) On the iOS device, touch Settings. 2) Touch Mail, Contacts, Calendars. 3) Touch Add Account. 4) Touch Exchange. Note: iOS 4.0+ allows multiple Exchange™ accounts. However, if you're on a device that doesn't let you add a second account, you can use IMAP to sync Gmail, CalDAV to sync Google Calendar, and CardDAV to sync contacts. 5) Enter the full ...
It turns out I missed one step: After login to Exchange, go to https://m.google.com/sync/settings and select iPhone (or other iOS devices) and choose calendars you want to sync on it. This is really confusing that I can hardly tell the differences between this and the settings in https://calendar.google.com/calendar/syncselect
Since I deactivated rootless in my Mac OS X, calendar.app has no problems with sync to our Exchange server.
Because the item was in iCloud's calendar server, I simply logged into the icloud.com (or mac.com) website and deleted the calendar event there. No complaining from the server and the item immediately disappeared from my Apple Calendar app.
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