Thanks for your quick and very competent help! Will come back to you when needed!
A long time devout Thunderbird user, I’ve recently had to switch to Outlook to comply with the new employer’s software policies. My mailboxes had thousands of messages in them and losing any of them was highly undesirable, to say the least. Thunderbird to Outlook Transfer was one of the first tools I found online and I never had to search again – it’s all there, and the process was flawless!