While troubleshooting disappearing free space from a customer’s SBS system partition I found a terrific resource, a list of all the log files on our SBS boxes. Wow what a great list and just in time for bed! :)
The ones I found to contain the largest amount of data were from IIS and from Exchange. In Exchange the Default SMTP Virtual Server is typically the specific location to change the log target storage directory. Open the IIS Admin interface and go to the property sheet for each website to configure logging changes.
It’s like the Energizer Bunny …going …going …going (or was that a pharmaceutical ad stuck in my head?) Those logs never get automatically deleted by default. Watch out!