When I move or copy an email from one Exchange account to another the content of the email is wiped (my other non-Exchange accounts are all fine). It happens on all my devices one running Windows 10 and one running Windows 11. It happens across all versions of Thunderbird (have re-installed etc). It started occurring on 26-Sep-24. Have been in correspondence with Boenex (re: OWL) since then but dialogue getting nowhere.

I have been using Tbird for 10 years and really like the program. I am having to start using Outlook, which I dislike. If it can’t be fixed then I will be forced to abandon Thunderbird altogether and stop my donations. I don’t know where to go from here. Is anyone able to point me in the right direction?