This article describes some of the major changes visible to users in Thunderbird version 91. Full details of all the changes can be found in the <a href="%(release)s">Thunderbird release notes from 91.0 and up</a>.
Iste articulo describe parte del major cambios visibile al usatores in Thunderbird version 91. Plen detalios de tote le cambios pote esser trovate in le <a href="%(release)s">notas de version de Thunderbird de 91.0 e ultra</a>.