The Quick Easy Way to Grant Full Access to an O365 Mailbox

This quick, easy to follow guide will help you to grant full-access permissions to an O365 mailbox in minutes.


To get started open a remote session using this PowerShell:


$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri -Credential $o365cred -Authentication Basic -AllowRedirection
Import-PSSession $session


In our first example, we’ll delegate full access  to a single mailbox. In this case, so that Jim has full access to Billy’s mailbox:


Add-MailboxPermission -identity -user -AccessRights FullAccess


In this example, we’ll give Jim full access to all mailboxes in the organization:


Get-Mailbox | Add-mailboxpermission -user -AccessRights FullAccess


And that’s it, you’re done!