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In the lower-left corner of classic Outlook, under My Calendars, right-click or press and hold your calendar.
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Select Sharing Permissions.
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In the Permissions tab, you can edit or add who you would like to share your calendar with and their permissions.
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Choose Apply or OK.
Notes:Â
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Select the (>) icon in the upper left if you don't see the left pane.
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In new Outlook, on the left below the small calendar grid, expand the account for the calendar you want to share. If Show all is visible, select it to ensure you can see all options.
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Expand My Calendars.
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Point at the calendar you want to share, then select  More options.
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Select Sharing and permissions, then look up a person by name and assign a specific permission level to them.Â
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Select Share.
