My boss requested me to use this package but retain the use of the Microsoft IIS log file format. I hope by sharing what I did I can save someone else some work.
I made the attached changes to awstats.pl to allow for parsing in our environment. I also made the following changes to the config file:
LogFormat = "%host %logname %time5 %other %other %other %other %other %bytesd %code %other %method %url %query"