Mozilla Sunbird for Linux (64-bit) is a redesign of the Mozilla Calendar component. The goal is to produce a cross platform standalone calendar application based on Mozilla's XUL user interface language. Sunbird is the standalone form of the Mozilla Calendar. Both use the same base code so their functionality is the same and they share the same bugs and bug fixes. The intended user is someone who uses Mozilla Firefox and Mozilla Thunderbird and wants a calendar application based on Mozilla.