If you want that you either need a custom form or you need to write code in
the Outlook VBA project to populate your UserProperty based on the DueDate.
In that case the formula would be different. You'd also have to manage not
only any task when it was opened but also when it is selected in a folder
view and modified using in-cell editing.

It's likely that custom task forms might not be compatible with other
applications.

--
Ken Slovak
[MVP - Outlook]
http://www.slovaktech.com
Author: Professional Programming Outlook 2007.
Reminder Manager, Extended Reminders, Attachment Options.
http://www.slovaktech.com/products.htm


"jparker" wrote in message
...
I would have to design a custom Task form? There's no way to add my field
behind the scenes while using the existing Task form, or hook into it
somehow? Would this replace the default Task form? What would happen with
tasks created automatically through other apps (through COM)?

Thanks,
Joel