PowerPoint does a lot of its own compression. That is probably why the
file size is not reduced much by zipping. There is no difference in the
file as a PPS or PPT. The files are the same. The different extension
tells PowerPoint to open it as a show. You might want to check out this
information about reducing file sizes in PowerPoint:
Why are my PowerPoint files so big? What can I do about it?
http://www.pptfaq.com/FAQ00062.htm
You might also look into the free PFC Express at:
http;//
www.pfcmedia.com/
It will help you email large files.
--David
--
David M. Marcovitz
Microsoft PowerPoint MVP
Director of Graduate Programs in Educational Technology
Loyola College in Maryland
Author of _Powerful PowerPoint for Educators_
http://www.PowerfulPowerPoint.com/