Have Moz TB installed on PC Win 10. Trying to install Moz TB on Laptop Win !!

The Moz backup is not Mozilla item and I can't recommend it. To copy a profile from one pc to another, these steps work: ''' BACKUP ''' # ensure thunderbird is not running on old PC # 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 ''' RESTORE ''' # ensure thunderbird is installed, run once, and NOT running on new PC # enter %appdata% in search window on task bar and press Enter key # delete the thunderbird folder # you should be in Appdata\roaming folder , copy&paste the exported Thunderbird folder there. # start thunderbird and all should be there The above steps move the profile and account. Assuming your account is IMAP and you want to salvage the email messages, these steps work: # click file>offline>download to check that all online messages are on PC # install the addon, importexporttools NG of not already done # highlight each folder, one at a time, in the account to save, rightclick and select the importexport option to export mbox # now, highlight 'Local Folders' # next, rightclick and, one at a time, click the importexport option to import mbox and import the exported mbox files. # browse each folder to ensure that the message content is there. Once done, you can create a new account for your messages. To place your messages within the new account, first, create the desired folders for the account and, then highlight, rightclick, and select the copy to menu option to copy the messages. Copying large numbers can be problematic, so you may need to copy portions at a time. After the copying is done, browse all the folders to ensure they are online. Do not delete the local folders until you are confident the messages are there.