I would like to know why Thunderbird duplicates emails in my archive after creating a summary file. How can I turn off this very annoying thing. Also all attachments are doubled. If there is already a doubling in my archive, it will be doubled again, so 1 becomes 2 becomes 4 etc. If I deleted the duplicates, they still come back after the next boot. Please send a massage to info@wilvancleef.nl.