Winzip will convert it either to one or several zip files.

http://www.winzip.com

You might also want to look at reducing the file size of the ppt file first.
Turn off "fast save " if its on!
Lots of pictures > picture toolbar > compress pictures (web/screen setting)
Lots of sounds > reduce the quality or convert to mp3

Usually there are limits placed by your/the recipient's email providers on the
maximum size of any single email and of the amount of stuff you can have in your
inbox at a time.  

If you exceed any of those limits, then you won't be able to send the file by
email.  Otherwise, no problem.

Yes, but unless you're using a VERY old version of PPT, it's already
well-compressed.  Zipping doesn't usually shrink PPT files much.

This has some further suggestions for putting your PPTs on the Weight Watcher
plan:

Why are my PowerPoint files so big? What can I do about it?
http://www.rdpslides.com/pptfaq/FAQ00062.htm

-----------------------------------------
Steve Rindsberg, PPT MVP
PPT FAQ:  www.pptfaq.com
PPTools:  www.pptools.com
================================================

You may want to take a look at PFCExpress for this.  (Fully automates
zipping and emailing a presentation.)

http://www.pfcmedia.com

Austin Myers
MS PowerPoint MVP Team

Provider of PFCMedia      http://www.pfcmedia.com

Try NX Powerlite program. Trial version available here.
http://www.nxpowerlite.com/index.php?ld=n

Talon