A common request of Exchange Server administrators is granting a person access to another mailbox. The Add-MailboxPermission cmdlet lets you grant permissions to a mailbox. There are three parameters to use:
- Identity – the mailbox you are adding the permissions to
- User – the user you are granting the permissions to
- AccessRights – the level of access you are granting
For example, to grant Sarah Jones full access to Alan Reid’s mailbox we would run this command.
[PS] C:\>Add-MailboxPermission -Identity Alan.Reid -User Sarah.Jones -AccessRights FullAccess
To remove the access we would use Remove-MailboxPermission instead.
[PS] C:\>Remove-MailboxPermission -Identity Alan.Reid -User Sarah.Jones -AccessRights FullAccess
Handling Auto-Mapping for Full Access to Mailboxes
When you grant full access to a mailbox you may notice that the mailbox automatically appears in the user’s Outlook, either immediately or after a short wait. 
This is due to a feature called auto-mapping. In some cases this auto-mapping behaviour is not desirable. To prevent auto-mapping we need to add -AutoMapping:$false to the Add-MailboxPermission command. If access has already been granted you must first remove it. Then run Add-MailboxPermission again with auto-mapping disabled.
[PS] C:\>Add-MailboxPermission -Identity Alan.Reid -User Sarah.Jones -AccessRights FullAccess -AutoMapping:$false
If you only want to grant read-only access to the mailbox refer to this article: How to Grant Read-Only Access to an Exchange Mailbox
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This article How to Grant Full Mailbox Access for a User in Exchange Server 2013 is © 2013 ExchangeServerPro.com
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