I have discovered that when creating a room mailbox in Exchange 2010 (v14.01.0270.001) the default setting on creation shows any meetings booked as ‘Busy’ when viewed by users in Outlook, & as there appears to be a bug in here this is how I have managed to allow the organiser to be visible.
In EMC Room MBX properties -> Set Resource-In Policy Request -> Selected Recipients -> Add any User or DL -> Apply, then remove the DL& set it back to 'All users'. Failure to add & remove a User or DL prevents the organiser from being viewed & just shows 'Busy'