System Drive on SBS 2003 Server Filling Up

I have a SBS 2003 Server that is fully patched.  Exchange and SharePoint are installed.  Exchange is used and the MDBDATA folder is located on a secondary drive.  SharePoint is not used.  Symantec BackupExec is installed and the catalog files are on a secondary drive.  SQL is running for monitoring, BackupExec, and SharePoint but the database files are relatively small.  Log files are kept to 2MB each.  Something is continously, a couple hundred MB daily, eating away at free space on the system drive.  I have not installed file monitoring software.  Any ideas has to what may be eating up free space on the system drive?
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Lee W, MVPTechnology and Business Process AdvisorCommented:
Install WinDirStat and run it as an administrator to find out.

Sounds like your doing a decent job managing the system, but more ideas/places to look can be found on my web page:
What he said. Hey, LeeW.
heikkilaAuthor Commented:
I did not need to install windirstat.  I read your summary table and looked in my IIS log file.  Deleteing old log files freed up 40 GB of disk space.
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