1) Login into your Gmail account with a web browser like Firefox. 2) once logged into Gmail and on the home page, click the settings cog wheel and then click the link that says "view all settings" 3) once on setting screen then click "labels" tab 4) once on liable tab screen go to the far right where it says "show in IMAP" click the empty check box so that it has an [x] in it for it to be included as a folder with syncing with Thunderbird 5) on label tab screen move left look for "show on label list" and look under this and click "show" for each folder you want to show in Thinderbird 6) solution complete