I assume that when I uninstall Thunderbird and later re-install it all my old emails and the account structure will be kept untouched and I will not lose it.

Question

I assume that when I uninstall Thunderbird and later re-install it all my old emails and the account structure (including tags etc.) will stay untouched. Is that right?

Answer 1

And there is nothing you can do about that except SAVE all of them and when you change the connection Protocol to IMAP or Exchange Active Sync you might be able to copy those emails back into the folders for the new connection protocol and have them all show up on the Outlook.com server.
The company I work for change their email hosting service to Office 365, basically Outlook.com, and I need to move all my current emails from the old hosting service to the Office 365 email system. I did that by saving all of them to Local folders on my computer then Copying them into folder I created for the Office 365 email system. They all appeared in the Office 365 Outlook webmail system and then they were available to multiple devices.
It was a Long Drawn out process and had some hickups but in the end I didn't lose any emails.