I have migrated my Comcast email account to Thunderbird. Some of my folders are missing. I can see and access Inbox, Sent, Trash and one of the other folders I had created on my Comcast email site. I can't figure out how to get he other folders to migrate to Thunderbird. I have deleted and re-added the Comcast account. Previously I used Thunderbird with my work email and all of my folders were visible.