If you get the below error when trying to get to move transactions logs in Exchange 2003 (Access is denied , ID no: c0070005 , Exchange System Manager)
go to http://support.microsoft.com/default.aspx?scid=kb;en-us;Q323915. However you may need to restart the node to get the registry permissions in effect.

Just spent the whole of sunday bringing back an Exchange cluster. I wonder why disasters happen on Sunday..