Old Outlook 2010 mails in mail thread mixes up lines & paragramphs in Thunderbird
When migrating from Outlook 2010 to Thunderbird on Linux, old mails looses the format and all lines images in the mail thread gets mixed up when we hit reply or forward. It appears it is something to do with formating. However not sure.
Opaite Mbohovái (1)
Have you tried closing and restarting Thunderbird in safe mode, to see if the problem persists then?