| http://www.w3.org/ns/prov#value | - Thunderbird also supports a large number of downloadable themes which alter the appearance of the client. - An addressing sidebar for mail compose which makes it easy and convenient to add address book contacts to emails. - Online help includes a FAQ, tips and tricks and other useful information. - Simplified preferences UI and menus. - Footprint and performance improvements.[License: Freeware| Re
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