Outlook 2010 has this cool feature that auto maps the mailboxes that you have full access to. But some times you want to have access to everyone email but not have them taking up space on your outlook.
This command will add full access for admin@example.com to everyone but the Admin mail box.
Get-Mailbox -ResultSize unlimited -Filter {(RecipientTypeDetails -eq 'UserMailbox') -and (Alias -ne 'Admin')} | Add-MailboxPermission -User admin@example.com -AccessRights fullaccess -InheritanceType all -AutoMapping:$false
And This command will add admin@example.com to the accounts mailbox.
Add-MailboxPermission -Identity Accounts -User admin@example.com -AccessRight FullAccess -InheritanceType All -Automapping $false