Why is Exchange server C partition filling up?

I have an Exchange 2003 server on a Windows 2003 OS.  Drive is parititioned into C (operating system) and D (exchange mdbdata dirs). Did an offline repair with eseutil this weekend and although it may be just a coincidence, something is writing to my C partition and filling it up so quickly I can't keep up. D partition is behaving perfectly. II've repointed the event logs with regedit, but have to reboot to establish the change. I'm afraid to reboot with little to no space in case it doesn't come back up.  What to do? Shadow copy is not on. No logs that I can find are on C. Ideas?  Thanks!!  
akalichAsked:
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briousdCommented:
You could do a search on the "c" drive for recent files,  last modified, it may find that is is not related to the exchange server
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Mike ThomasConsultantCommented:
Transaction logs, where are your exchange log files? C: by chance?
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Alan HardistyCo-OwnerCommented:
I have used Foldersize to track down where my space is getting eaten up before - it is free and very handy.
http://foldersize.sourceforge.net/ 
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akalichAuthor Commented:
Transaction logs are on D. But a logical assumtion, Mojotech!  :-)  Foldersize sounds like a good idea. I'll try that now.  Thanks.
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notacomputergeekCommented:
Another free utility to identify space allocation is:
http://windirstat.info/
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akalichAuthor Commented:
Mmm.... Haave you used Foldersize on a server?  It looks like it's for desktop O/S or am I missing something?
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Alan HardistyCo-OwnerCommented:
Yes - on 2003 it is fine.
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akalichAuthor Commented:
Any other ideas?  Something is eating it so fast I can't get enough space long enough to attempt a reboot plus I can't load Foldersize because of no space.  I tried loading it on a different partition but no, still apparently something was trying to load on C.  Does anyone know how much free space I should have to have a prayer of rebooting successfully?  Thanks!
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Alan HardistyCo-OwnerCommented:
Can you check you are not on any blacklists as a precaution?
http://www.mxtoolbox.com/blacklists.aspx
If you are - then you probably have an infection.
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akalichAuthor Commented:
Nope, no blacklists. And I went through the AV files, clean there too.
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Alan HardistyCo-OwnerCommented:
Okay - that's good news at least.
Can you run Disk Cleanup on the server?
 
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akalichAuthor Commented:
Now there is zero bytes. I can't even figure out why it's UP. And I've removed everything I can get at...however there is never enough room to do a proper uninstall. Or a proper reboot which might be the answer. Is there anything you can think of?
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Alan HardistyCo-OwnerCommented:
Perhaps your IIS log files are filling up due to lots of web-based activity?
C:\windows\system32\logfiles\w3svc1 or other similar folders.
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akalichAuthor Commented:
That's one I had forgotten. Not a lot there - just cleared 1.5 MB  yes...MB.  and that disappeared immediately. Do you think I have a prayer of rebooting this beast?
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Alan HardistyCo-OwnerCommented:
I would pull the LAN cable and reboot the server.  You may find things calm down.  If they do, tidy up a little and then install Foldersize, then plug the LAN cable back in.
Monitor it carefully.
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