Most mail servers have a limit of 2-5MB, so you've far exceeded that. You
can try some of the suggestions below, but if you can't dramatically reduce
the size you will have to distribute it via a web page, an FTP server, or a
CD, for example.
Why are my PowerPoint files so big? What can I do about it?
http://www.rdpslides.com/pptfaq/FAQ00062.htm
