Microsoft, Exchange, 2003, Public Folder Calendar, Time Zone Issues.

There is a team public folder calendar that posts all the vacation time for the entire team.
I have a user in Houston (Central Standard Time) accessing the Public Folder Calendar which is homed in Pittsburgh. When this user looks in Houston looks at the calendar, sometimes vacation times bleed into our days.
For example, a user or manager in Pittsburgh puts in for a day off on December 19th but when the user in Houston opens the calendar it shows that particular user having both December 18th & 19th off since the days shows 11am-11pm.  The vacation day is marked as an all day event when entered on the Pittsburgh side and when I look at it, it shows the following:
Start Time: Fri 12/19/2008 12:00AM
End Time: Fri 12/19/2008 12:00PM

User in Houston sees the following:
Start Time: Thu 12/19/2008 11:00PM
End Time: Fri 12/19/2008 11:00AM

The user also reports the following:
"She said that everyone else in her group including a Finland user they don't have this problem."
"User said that this workaround from Microsoft or the Holiday work around will not work."
First would check that you have updated the PCs with DST Patch.
http://support.microsoft.com/gp/cp_dst

If the PCs have already been patched, I would check that they all have the latest Office 2003 SP installed:
http://www.microsoft.com/downloads/details.aspx?FamilyID=E25B7049-3E13-433B-B9D2-5E3C1132F206&displaylang=en

The problem is that an all-day event in one time zone actually does occur at a different time in another time zone. There is a workaround for this which you can find here: http://support.microsoft.com/kb/262451

There is one other option, though... but it's cumbersome... and that's to create a custom "holiday" file. Because holidays are not based on the clock, but rather just the day. You'll find info about how to do that here:
http://office.microsoft.com/en-us/help/HP012304061033.aspx#4


Any Thoughts?