https://support.mozilla.org/en-US/kb/moving-thunderbird-data-to-a-new-computer

Some email accounts (such as Gmail) want a unique password assigned to each device on which the account is located. If that applies to your accounts, I can't offer help. BUT, if your account uses the same password on all devices, my suggestion may help: Here are the steps to transfer a profile to a new computer. Follow the steps 100%. These steps copy the passwords in addition to all the account info and other settings. Hey, it may work. :) Here is the link for moving a profile in Windows when installed in default location: https://support.mozilla.org/en-US/kb/moving-thunderbird-data-to-a-new-computer here is the info in brief steps: # ensure thunderbird is NOT running on old machine # enter %appdata% in search window on task bar and press Enter key # this should open windows file explorer in Appdata\roaming folder # highlight the Thunderbird folder and copy to external media # ensure thunderbird is installed on second computer and NOT running # enter %appdata% in search window on task bar and press Enter key # 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 BUT, I encourage you to eventually secure the password, and that may be a contact to your email provider. The password that is stored in Thunderbird can be found at settings>Privacy&security.