Saving Outlook attachments to storage card?

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I just got my wife a new Cingular 3125. The option to save mail attachments to a storage card is not present. I found the registry entry on my Wizard which tells it where to save attachments and attempted to add that key to the 3125, but it gave me an error. Does anyone know if it's possible to save attachments to the card by default? My wife never deletes any of her e-mail so she'll quickly fill up the main memory if attachments get saved there.

Thanks