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I'm trying to restore my Thunderbird mailboxes from my old (essentially dead) computer's backup to a new computer. My first attempt failed. I need to understand what went wrong and how to correct it.

I installed Thunderbird on the new computer and used Profile Manager to create a profile in the location where I want to keep it (in the Documents folder, to simplify backup). Then I found the place where the mailboxes were kept and copied my old mailboxes there from the backup.

Then I started Thunderbird. Instead of displaying my old Inbox and a list of mailboxes, it displayed a screen that prompted me to define my email account. OK, that's fair; if the account information wasn't in the files I copied, Thunderbird would have to do that. After I defined the accounts (there are three), I quit and restarted Thunderbird, and it displayed my Inbox and mailboxes.

But not quite as I expected. I expected to see the mail that was on the old computer when I last backed it up. Then I planned to download mail to get everything that came in after that. Instead I found that Thunderbird had erased everything I copied over, then downloaded the new mail without me asking it to.

Now what? The new mail is still on the server, so I can repeat the whole process if I have to. First, though, I need to understand what went wrong.

I tried to open Firefox, and a message display that said it was updating, after Firefox updated/or tried to update when I clicked on the icon and try to open Firefox, I get this error "firefox error code 0xc000012f", after closing this message window, I get another message window. Both error messages are contained in the attached file.

I can't use Firefox at all, because I can't create any profile. I haven't ever installed Firefox in the past on this computer. The error message is attached as an image. Here are the things I've tried: Reinstalling Firefox multiple times, both the exe and the msi Running Firefox as administrator Deleting/renaming the profiles.ini file and the Firefox folder Trying to make the folder not read only with the properties Trying to make another folder elsewhere that isn't in appdata roaming, which doesn't show the error message, but gives another message saying "your changes couldn't be saved" and closes firefox immediately without creating the profile (other screenshot)

Another thing to note is that I'm only able to install Firefox by running the installer as administrator, because it shows an error message "can not create temp folder archive" and stops working.

Please help, I really want to use this browser.

I had an update notice when I came on this morning. I updated it and turned my PC off and on. Now, a few hours later, there's ANOTHER update? Now we get several daily??

There must have been an update for Thunderbird that screwed up the way I have been using Thunderbird for years now. I had sub folders under inbox. For example, I had an investment newsletter go into a sub folder under inbox labelled "inv". I had a filter set up to move emails that had the name of the newsletter in the title to go to that "inv" folder. In this new version of Thunderbird, those separate sub folders are gone. The filters are still there but the folders are gone. Now all emails just go into the inbox. Is there a way to roll back to a previous version?

TIA Eric