Because other calendar programs do. Outlook has to distinguish itself
somehow, right?
Besides, it leaves room for third parties to come up with solutions like
this:
http://www.outlook-tips.net/howto/age_form.htm

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Milly Staples [MVP - Outlook]
Post all replies to the group to keep the discussion intact. All
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After furious head scratching, Aloha Annie asked:
| Other calendar programs calculate Birthdays and Anniversaries from the
| inception date - why doesn't Outlook?
[quoted text clipped - 5 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=849aa23b-6a26-4
9a2-b920-2fd41af55d95&dg=microsoft.public.outlook.calendaring
kj - 05 Sep 2005 07:12 GMT
Interesting though that Microsoft Windows Mobile Calendar already does this
out of the box.

Signature
/kj
> Because other calendar programs do. Outlook has to distinguish itself
> somehow, right?
[quoted text clipped - 14 lines]
> |
> http://www.microsoft.com/office/community/en-us/default.mspx?mid=849aa23b-6a26-4
9a2-b920-2fd41af55d95&dg=microsoft.public.outlook.calendaring