Because there is no Mac version of Publisher. WinOffice doesn't come with
Entourage, either. There's even an FAQ:
http://www.microsoft.com/office/publisher/prodinfo/faq.mspx
"Q.
Is there be a Macintosh version of Publisher 2003?
A.
No. There are no plans to develop a Macintosh version at this time. However,
we monitor the Macintosh customer segment continually to assess whether
customer demand would be sufficient to develop Microsoft Publisher on that
platform."
So if you want it, get monitored by using Send Feedback under Help to tell
the MacBU you would pay extra for it.
I'm not familiar with Publisher, but I vaguely believe AppleWorks includes
some of its features?
DM