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Importing to thunderbird from an old laptop to thinderbird on a new laptop. All options in the import tool fail

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I am importing all of my thunderbird data from an installation on an old laptop to a new thunderbird installation on a new laptop. I used the export tool on the old machine and the import tool on the new machine and every installation option fails. On the old machine I have tried copying the files and folder to the new machine and it fails, I have created a zip file (5MB) on the old machine and copied to the new machine and it fails (Not using the Zip tool that is limited to 2MB). I think I have tried every combination. The new installation is able to send and receive messages.

I am importing all of my thunderbird data from an installation on an old laptop to a new thunderbird installation on a new laptop. I used the export tool on the old machine and the import tool on the new machine and every installation option fails. On the old machine I have tried copying the files and folder to the new machine and it fails, I have created a zip file (5MB) on the old machine and copied to the new machine and it fails (Not using the Zip tool that is limited to 2MB). I think I have tried every combination. The new installation is able to send and receive messages.

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These steps have worked well for many users:

  1. ensure thunderbird is NOT running on old machine
  2. enter %appdata% in search window on task bar and press Enter key
  3. this should open windows file explorer in Appdata\roaming folder
  4. highlight the Thunderbird folder and copy to external media
  5. ensure thunderbird is installed on second computer, started once and NOT running
  6. enter %appdata% in search window on task bar and press Enter key
  7. you should be in Appdata\roaming folder , copy&paste the exported Thunderbird folder there. This may prompt to overwrite an existing folder of same name. allow it
#   start thunderbird and all should be there 

The export/import never seems to work. but the above steps do.

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