Outlook itself does not include any date picker control (which, by the way, is one reason why the first page of the appointment, journal, and task forms is not editable). See http://www.outlookcode.com/d/datepick.htm for controls you can add.
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Sue Mosher, Outlook MVP
Author of Configuring Microsoft Outlook 2003
and Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers
Since that control doesn't come with a setup program, you will need to copy the .ocx file to the machine, then run Regsvr32 <path to the ocx file> to register it.
Alternatively, include the control in a VB project, then use VB to create a setup program.
--
Sue Mosher, Outlook MVP
Author of Configuring Microsoft Outlook 2003
and Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers