I downloaded Thunderbird (TB) on new computer. Set up all he settings for send and receive. All email downloaded but into one folder. Tried to follow instructions on how to export/import to no avail. Uninstall TB and reinstall but same thing happens. Bought new computer two months ago and getting frustrated as I do not know what I am doing. I am not a techie just a skilled user. Detailed step by step suggestions greatly appreciated.