Windows Server - IIS log files filling up my drive

I have a severely under utilized SBS2008R2-sp2 server. It does not support
any websites. The files in the web root are the default ones. We use Exchange
and store files, and rarely log in remotely.

We stopped receiving emails recently and I was asked to find out why. I
found the c: drive at 99% full. Exchange is on d: drive. I found 13 gigs of
IIS log files and moved them to another drive to fix the problem. But, why is
IIS generating so much data? Where can I find information on all the
different IIS log file categories?

One folder W3SVC1372222313 was a real hog with single day log files at
300,000 KB. The server was built in Jan 2010 and 13 gigs seems excessive?
What should I be concerned about? How are limits enforced on such log files.

Also, I have this huge 500,000 KB console.log file.

Thanks,
Kurt

Kurt, let me introduce you to Susan:

IIS 7 on SBS 2008 - logging is going haywire - Server Fault:
http://msmvps.com/blogs/bradley/archive/2010/03/04/iis-7-on-sbs-2008-logging-is-going-haywire-server-fault.aspx

And, to the top level of SBS support at Microsoft:

Reclaiming Disk Space Lost to IIS Logs on SBS 2003 and SBS 2008
http://blogs.technet.com/sbs/archive/2008/02/28/reclaiming-disk-space-lost-to-iis-logs-on-sbs-2003.aspx

These are both excellent resources for information about SBS and related
topics, so please consider checking in with them periodically.  (Susan blogs
daily, and the SBS team less often but still frequently).