: To open another person's Mail, Calendar, or People folder, both you and the other person must have a Microsoft Exchange account, and the account owner must grant you permission.
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On the File menu, point to Open, and then click Other User's Folder...
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In the Folder Type list, click Inbox, Calendar, or Address Book.
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In the Search box, type the name of the person who granted you access, click the person's name in the search results, and then click Open.
The shared Mail folder appears in the Folder pane. The shared Calendar appears in the Folder pane under the Shared Calendars heading. The shared Address Book appears in the Folder pane under the Shared Contacts heading.
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If you receive the message "Outlook was redirected to the server autodiscover-s.outlook.com to get new settings for your account.". choose Always use my response for this server and click Allow.
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If you have a shared folder selected in the Folder pane, new items that you create are saved in that shared folder.
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To remove another user's shared folder from your Folder pane, hold down Control, click the folder, and then click Remove Shared Account.
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See also
Share a folder in an Exchange account (Linked article is actually titled Share a folder in an Exchange account, but this text is a better title for it)