Windows 10 lies. It does not move your email data unless you use a Microsoft email program.

on the new start menu type %appdata% into the search box and press enter. explorer will open in the appdata folder. which will contain a Thunderbird foldedr

Now your hard disk should contains a windows.old folder. Somewhere in there will be your old appdata folder copy the Thunderbird folder from the old to the new and start Thunderbird.

Thank you so much. It certainly does lie! Windows 10 hadn't even backed up Thunderbird into the old appdata folder! Luckily I had cloned my disk before installing Windows 10 and I managed to retrieve the data from there.

The old emails are now fine. I am still having problems with the address books. I have several, for different groups of people. The are number impab-1.mab to impab-5.mab. However, Thunderbird is only reading the basic impab.mab one.

I know I had this problem last time I got a new computer and I managed to solve it. But I can't remember how!

Any tip?

Thanks again

Alison

I would guess you used this add-on https://freeshell.de//~kaosmos/morecols-en.html

No. This is what I did. If you go into the Address book tab in Thunderbird, then choose 'file' followed by 'new', one of the options allows you to create a new address book.

And now I've remembered how I sort of did it and have just adapted that and it seems to work: - create a new address book in Thunderbird and close. Name it 'temp' - open the profile in appdata and it will be there with a suffix eg abook-1.mab - go to the old profile and find one of the old address books. - make a copy to the desktop and rename it to the new one created in the profile. - copy the old one to the new one - open up Thunderbird and go to address books. Rename 'temp' to whichever of your address books has been copied eg family, friends etc.

You make it hard when there is an add-on. (see Matt's link)

The add-on offers a simple import option. While our way works, it is slow and tedious