<http://schema.org/description>
"Postbox is a commercial e-mail client, based on Mozilla Thunderbird. Is is mostly a layer of polish and OS integration on top of a popular open source project. Postbox 2.0 was recently released, and the company behind it, Postbox"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mikkel.hoegh.org/2010/10/08/postbox-upgrade-policy-censor-customer-complaints/>