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In the left folder pane of classic Outlook, select Deleted Items or Trash. If you don't see the left folder pane, select the greater than (>) icon.
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Find and select the calendar item to recover. If you can't find the calendar item in Deleted Items, see Recover deleted items from the server.
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Select Home >
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Calendar should be highlighted. If not select it, then select OK.
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Switch to
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In the folder pane on the left, select  Deleted items.Â
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In the item list, select the event you want to recover.Â
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On the Home tab, selectÂ
The item is restored to your calendar.
