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Folders on MS Exchange server

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?
2 Solutions
Those files are backups that are created each time the system is updated with a patch or hotfix. In the event you were to uninstall a patch, windows would use these files to restore the previous file versions. They are safe to delete. I usually delete all of them that are older than a year. You can whack them all if you are confident you will not unistall updates.
Also, if you want to get a better view of where your space on C:\ is used, try using SequoiaView. It is a graphical tool that can show you where the big files are

dali6Author Commented:
Thank you both.
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