I'm having this pretty weird problem. Our Dell, factory installed, SBS 2003 installation keeps running incredibly low on disk space on the system partition. The hard drive installed in the server is a 500GB, but Dell only partitions the C Drive with 25GB of space. I've moved all the Exchange 2003 data to the D partition as well as user files and such, so there shouldn't be any great increase in data over time.
Regardless, every 2-3 days the server requires a restart. It will run through 5-6GB per 2-3 days for apparently no reason. As soon as the server is restarted all that space is magically back and available to the system again. Another 2-3 days pass and the server runs out of space and the cycle starts again.
I've run disk cleanup (shows nothing worth deleting/removing). I've run TreeSize Free edition, which shows which folders are taking up the most data and nothing at all seems out of place. The really weird thing is that it only shows around 10GB (out of 25GB) used regardless of whether the server has run out of space or whether it has 6GB free after a restart.
Not sure where else to look. I notice that TreeSize does not report the size of the system volume information folder on the C drive (due to access denied). Is it possible this folder is eating up the space on the C drive and then releasing it after a restart?