Hi! I am trying to rid myself of Microsoft Outlook and am transitioning to Thunderbird. I will speak in Outlook terms... I want to do the same with Thunderbird. My Outlook activity is saved on the server and on my hard drive as .pst files. I periodically do a backup up by simply copying them to another drive. I would like to do the same in Thunderbird but don't know what the file name, extention or folder name/locaton is. What is the file name and extention for the Thunderbird version of these files and what folder on my hard drive can I find them? A search on C:/ for .mbox returns nothing. Your insights will be welcomed! Jim