yes ms outlook pst files can easily exported from outlook and import into Thunderbird, please follow simple steps. # first you need to export your pst file or find your pst file, this is the location of outlook pst file C:\Users\PC\AppData\Local\Microsoft\Outlook # then you need to convert your pst file into mbox, because Thunderbird support mbox file (you can use any third party tool available online. i searched and found this tool [removed] ) # software will help you to convert your from outlook pst to mbox file format # then you need to mozilla importexport tool from here https://addons.mozilla.org/en-US/thunderbird/addon/importexporttools/ # then import single or multiple mbox files easily enjoy