Adding Editor Permissions to a AD Security Group

Hi,

Requirement: Add an AD Security Group with "Editor" rights on all MeetingRoom objects in the Exchange 2010 organization using Powershell.

MailEnabledDistribution Group alias = abcd1

The PS command I am running is :-

$all=Get-Mailbox -RecipientTypeDetails RoomMailbox

ForEach-Object {_.item in $all} {Add-MailboxFolderPermission -Identity ($item.alias+:\Calendar") -User abcd1 -AccessRights "Editor"}

Is this the right PS command or a better one exists to accomplish the goal.

Cheers

H

HA