I presume you have thunderbird in another PC and want it in the new PC? There are two ways: - click tools>import>import from a file and follow the menus for addressbook to the option for file types. pick the 'sqlite' option and then locate and select the abook.sqlite file from old profile. then, repeat the process and select the history.sqlite file from old profile - the other option is to exit thunderbird and simply copy the abook.sqlite and history.sqlite files from the old profile and paste into the new profile. You can locate your new profile by clicking help>troubleshootinginformation, scroll to 'profile folder', click 'open folder' and then exit thunderbird. you will be in the profile.