No, categories are specific to the machine on which they are shown. You
cannot impose your categories/colors on someone else's calendar.

--
Milly Staples [MVP - Outlook]

Post all replies to the group to keep the discussion intact.
ALWAYS post your Outlook version.
How to ask a question: http://support.microsoft.com/KB/555375


After furious head scratching, JGT asked:

| I'm using Outlook 2007 in a standalone setup (e.g. I'm not using
| exchange). When I make an appointment of any kind I assign it to a
| category and I also invite my wife so the entry will also appear on
| her PC in her Outlook 2007. When she downloads her email one of the
| items is the invite from me. When she accepts it appears on her
| calendar but it no longer has the category I assigned to it (it does
| not have any category assoicated with it). Is there anything I can do
| so the category I assigned to it will also be reflected in her
| calendar without any action on her part? Along with the category I
| want the same color assigned to it.