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Right-click or press and hold the name of your calendar in classic Outlook.
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Select Sharing Permissions and then select the Permissions tab.
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Under Currently sharing with choose a contact.
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Choose Remove.
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In the pane on the left, under the calendar grid, point at the calendar you want to stop sharing, and select  More options in the new Outlook​​​​​​​ for Windows.
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Select Sharing and permissions.
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Choose a contact you wish to remove.
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Choose
