Quarantined Mobile Devices - Powershell

Hey Everyone --

I am trying to put together a Powershell script to approve a device that has been quarantined.  By default, we quarantine everything and allow only what we want.

$MobileDevice = Get-MobileDevice -Mailbox jdoe -Filter {DeviceAccessState -eq 'Quarantined'}
# allow the device
Set-CASMailbox -Identity jdoe -ActiveSyncAlloweDeviceIDs $MobileDevice.DeviceId

By doing this - mail is now working on that mobile device, however, it still shows up in the list of quarantined devices.   Furthermore - It is still returned as a quarntined device in the Get-MobileDevice cmdlet.

Using powershell - how do you get it so it is no longer in the quarantined list?

Thanks

Steve