If you can wait for Office/Outlook 2007, you may be pleasantly surprised.

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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, Dsadam asked:
| I am looking for a way to have the start and end dates of tasks be
| automatically indicated on my calendar. I recognize I can create a
[quoted text clipped - 8 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=5ca08b46-5da0-4
5c4-b743-1c8827295347&dg=microsoft.public.outlook.calendaring