Block iOS 6.1 OK but it also blocks the fix update  iOS 6.1.2 so now I need to know how to keep iOS 6.1 blocked but unblock  iOS 6.1.2  ---  PLEASE!!!  I now have 1500 irrate iDevice users who were told to upgrade to iOS 6.1.2 to get out of trouble BUT THEY STILL GOT BLOCKED. 

Anyone got the Powershell knowledge to help me out?

You can list all of the devices and sort out the IOS devices that should be allowed and explicity allow them

You can use the following Powershell commands to do that.

Get-ActiveSyncDevice | ft DeviceOS, DeviceUserAgent, DeviceID, DeviceType, UserDisplayName

This command will list the devices and the information you need to sort them out.

Then you can add a rule to only allow DeviceID's that have been approved by an admin. 

Set-CasMailbox username ActiveSyncAllowedDeviceIDs xxxxx1,xxxxx2

You can chose to put the rest of the Devices into Quarantine.

There are 3:rd party software that does this for you automaticly like PointSharp Mobile Gateway.

\Mattias