To grant full access to an Office 365 Mailbox you must first connect to the remote PowerShell, by typing the 3 commands in your local PowerShell:

$o365cred=get-credential
$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://ps.outlook.com/powershell/ – Credential $o365cred – Authentication Basic – AllowRedirection
Import-PSSession $session

After you are connected, you must run the following command to give Alan full access to Bob’s mailbox:

Add-MailboxPermission -identity [email protected] – user [email protected] – AccessRights FullAccess

If you wanted to give Alan full access to all mailboxes in your environment you would run:

Get-Mailbox | Add-mailboxpermission -user [email protected] -AccessRights FullAccess

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