Administrators and master users can create new delegations of their Exchange Online mailbox or mailbox folders and add users. The users and the user groups that you delegate the mailbox or the folders to can use the mailbox to read and send emails.
To delegate, an administrator must have the Sharing capability on the Exchange Online virtual client where the Exchange Online mailbox is configured.
Creating a New Delegation of a Mailbox or Folder
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From the navigation pane, go to Protect > Office 365.
The Office 365 Overview page appears.
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Click the user account in the upper-right area, and then go to View > Self-service view.
The Self-service dashboard appears.
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On the Self-service dashboard, in the Exchange Online section, click Restore.
The message selection page appears.
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On the left pane, select the mailbox or folder you want to delegate, and then at the top of the page, click Delegate.
The Create new delegation screen appears.
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Next to Delegate to, click Add user.
The Delegate to screen appears.
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Enter a user or user group name in the Delegate to field, and then click Save.
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On the Create new delegation screen, click Save.
Result
The user or user group you added will now be able browse the delegated mailbox or folder. The users cannot delegate or delete these folders or mailboxes. They can only preview, view, download, reply to, or forward the emails