BorisS wrote:

is there a way to get a public folder to help in this problem?

Not with ActiveSync. You can buy thrid-party sync tools that will allow
synching with multiple calendars, but your Windows Mobile device can't
really handle multiple calendars. The sync tool adds extra entries with
special characters in the names and categories in the entries to simulate
multiple calendars. One such tool is he
http://www.chapura.com/pmp_wm.php

If we set up a shared public folder, can I make that folder become the
default delivery location for each person, and thereby have
Activesync basically sync with that?

Nope. Public folders can never be delivery locations.

Or is there a way to mirror in
the default folder everything that happens in a favorites public
folder, which will then give offline functionality for the public
folder, which syncs up with the default folder, which then syncs up
with Activesync?

There are third-party tools you can buy that will sync calendars. Start
he http://www.slipstick.com/addins/calendar.asp
--
Brian Tillman [MVP-Outlook]