I have a Microsoft Exchange server version 2003 on my job network whose system partition is getting very full. The person who originally installed the server made the system C:\ partition too small. Now the Exchange database resides on another partition on the server which is ok. My problem is that the system C:\ is too full and not allowing for Anti-Virus updates to come in. I notice in the C:\Windows folder there are huge amounts of folders taking up space with the names $ExchuninstallKB#####$ and $NTUninstallKB#####$ etc. Does anyone know what these folders are for and can they be moved or deleted without causing a meltdown?