Calendar compatability Outlook 2002 and 2003

[matt]

Our users have Outlook 2002 or 2003. I have a group of users that need to
share calendars. They recently advised me that there are issues between the
versions-those running 2002 cannot see the free/busy time of those using 2003
when setting meetings, the 2003 users cannot access the 2002 calendars, etc.
Our original plan was to upgrade all of the 2002 clients in this group to
2003, then several of the users made it known that they did not want to lose
the free/busy connectivity with 2002 users in the rest of the organization.

Are there known issues sharing calendars between outlook 2003 and previous
versions? If so, are there work arounds? We will not be able to upgrade the
entire organization...

Thanks in advance!