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I don't think you can do it.
E-mails are examined by ActiveSync in date order. So, if you have it set to sync the last 1 week of e-mails, you'll get the absolute latest week's worth of e-mails, regardless of which folder they went in, subject to any storage limits. You can, though, have e-mail attachments stored on a card (not the e-mails themselves, though) to save space. Or, you can configure ActiveSync to limit how much of each e-mail is sync'd, and you can have AS simply not pull down the attachments unless you click on the "download attachment" icon for the particular e-mail.
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