By default, all software supports multiple file extensions. Mozilla Thunderbird supports at least 17 different file extensions. The basic files that Mozilla Thunderbird supports are .EML. However, not all of the extensions listed on the list are always used to save the effects of work in Mozilla Thunderbird. Very often, files with such extensions are used as source data files used by Mozilla Thunderbird.
Mozilla Thunderbird can be used to convert file formats between the file extensions listed below. You can open a file with one of the file extensions below via Mozilla Thunderbird and try to save it in another file format, also supported by Mozilla Thunderbird.