Because it isn't Groupwise.

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Milly Staples [MVP - Outlook]
Post all replies to the group to keep the discussion intact. All
unsolicited mail sent to my personal account will be deleted without
reading.
After furious head scratching, The Scheduler asked:
| I schedule recurring meetings one full year in advance - There are
| times when I know the meetings are not going to happen - holidays,
[quoted text clipped - 9 lines]
| button, follow this link to open the suggestion in the Microsoft
| Web-based Newsreader and then click "I Agree" in the message pane.
http://www.microsoft.com/office/community/en-us/default.mspx?mid=fba0070d-ab58-4
476-b445-86c531f254b6&dg=microsoft.public.outlook.calendaring