I have two calendars - a private one in my personal folder and a business one
in my exchange folder which others can view.  My business calendar is a
subset of my private calendar entries.  (I need two diaries as others I share
with are not on my exchange server and my private diary is shared with them
using workgroupshare.)

I use a view I have defined to filter my private calendar to only select
business entries and then copy this to the business calendar (deleting the
all the entries before I copy the new set over).

The entries all copy across fine except those that have invitations to or
from others - in which case the label colour changes from what it was set in
my private calendar to none in my business calendar.

Any suggestions?