PS Exchange – Mailbox Permissions

To see permissions on a mailbox:
Get-MailboxPermission -Identity User| where isinherited -eq $false

Snippet to add permissions:
Add Full access:

$MailboxPermission = @{
    'identity' = "Bob Harris"
    'user' = "Bill Goat"
    'AccessRights' = 'FullAccess'.'DeleteItem'
    'AutoMapping' = $true
}
Add-MailboxPermission @MailboxPermission

Possible permissions: FullAccess, SendAs, ExternalAccount, DeleteItem, ReadPermission, ChangePermission, ChangeOwner

To Remove Full Access:
Remove-MailboxPermission -identity "Bob Harris" -User "Bill Goat" -AccessRights DeleteItem -Confirm:$false