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In classic Outlook, in  Calendar on the Home tab, selectÂ
 Share (or Share Calendar), then choose the calendar to share.If you don't see Share on the ribbon, at the right end, select  More commands, choose Share, and then select the calendar to share.Â
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Select Add, enter the name or email address of the person or group you want to share the calendar with, and then select Add. If Ou​​​​​​​tlook opens a message, select To and add names or email addresses. Select To on the bottom to add each name.
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When you've added everyone you want to share the calendar with, select OK.
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Select a permission level, then select OK.Â
For more info, see Share an Outlook calendar with other people.
Note: If you'd like to see other people's calendars, email them and ask them to share with you.
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In new Outlook, on the Home tab, select  Share calendar, and if necessary, select which calendar you want to share.
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Type whom to share with in the Enter an email address or contact name box. If the person's name appears in a list, select it, otherwise press Enter.
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Choose a permission level (Can view all details, etc.) for the person from the dropdown and select Share. To add more names, repeat steps 2 and 3.Â
Tip: If you're in a company, under Inside your organization, select their permissions next to People in my organization.Â
To learn how to access a calendar that's been shared with you, see Access a shared mailbox.
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In Outlook for Mac, in Calendar, select the calendar to share and choose More options > Sharing Permissions.
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Select  (Add), enter the name or email address of the person or group you want to share the calendar with, select a permission level for them, and then select Add. Repeat this step as necessary for other people.
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When you've finished adding people to share with, select Done.
For information about permission levels, see Permissions levels defined.
Note: If you'd like to see other people's calendars, email them and ask them to share with you.
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In Outlook on the web or Outlook.com, on the Home tab, select  Share calendar, and if necessary, select which calendar you want to share.
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Type whom to share with in the Enter an email address or contact name box. If the person's name appears in a list, select it, otherwise press Enter.
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Choose a permission level (Can view all details, etc.) for the person from the dropdown and select Share. To add more names, repeat steps 2 and 3.Â
Tip: If you're in a company, under Inside your organization, select their permissions next to People in my organization.Â
To learn how to access a calendar that's been shared with you, see Access a shared mailbox.