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Hi, I recently moved to a new computer (win 10 to win 10). I wanted to transfer all of my e-mails, folders and accounts/settings, and plugins.

Initially, I tried using the good old mozbackup (yeah I know it isn't supported but last year I was able to use it without any issues on a laptop I took with me for a trip). It didn't really work well this time. It is a very big backup - 34GB (with over 140GB on disk size which is strange).

So I tried to start over, deleted all the accounts, created a new default account, and copied the Thunderbird folder from the old PC to the new one in its entirety to the new computer.

It seemed to work but after looking at my folders (I use quickfolders) I see that many of the older folders (which do work fine on the old PC) are now empty and after the restart, they are also duplicated (again not all just the older ones - not sure why these are affected and not the new ones).

How do I solve this issue? (I looked around and there are many suggestions but not too many success stories).

Iddo

I use a MacBook Pro v. 10.15.7 (Catalina), and I live in the UK. I am going to upgrade my old MacBook Pro to a MB Air, and my Time Machine has stopped working. While researching a solution I found that perhaps there was not enough space on my HD to 'create a snapshot'. So in the process of deleting stuff in order to make space, I found lots of 'duplicates' in the Apps Storage section of the HD, I thought it was safe to delete them as the 'originals' would still be there (same date, same size). I now know I have been very ignorant/stupid (my dog died a few weeks ago and my mental health hasn't been the same since.) However, I was very mistaken and seem to have deleted a lot of my working apps, the most important of which being Thunderbird, which gathered my 4 different email accounts. I'm not sure what version I had last, as it has disappeared, but I'm pretty sure it would be the latest version. My latest download is 68.2.2 (20.11.19). So I tried to reinstall it, but came across this notification 'You have launched an older version of Thunderbird... Create new profile, or Quit.' I googled this but being a not-very-techy senior lady, I can't make sense of what I should do, my main concern being not to lose all my settings, my emails saved in folders, as well as being able to receive and send. I am sure I saw some reference in the past of a library which would contain the emails, but don't know what to do about this notification. The other problem, of course is that I can't completely rely on Time Machine as my last backup is dated 24.7.23. Thank goodness today is a Sunday as there should be less traffic on my email accounts (I am involved with lots of local activities, including being a community journalist). I would be so grateful if someone could help me navigate this minefield and reinstate my app so it works as closely as it did before. Many thanks in advance for your help and patience.

Help instruct me on what I can do or Thunderbird can do to migrate/restore my legacy data since I installed that application on my new computer. Most of my historical contacts, messages and such are not available...