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Subscribing to or unsubscribing from folders (labels) (See Priority Inbox overview for more details about this Gmail feature.)
Important: contains messages that Gmail has flagged as “important”.
Starred: contains messages that were starred (either by Gmail or Thunderbird). Spam: contains messages that were marked as spam (either by Gmail or Thunderbird). Any messages that you see in the inbox will also appear in the /All Mail folder. All Mail: contains all the messages of your Gmail account, including sent and archived messages. There is also a set of special sub-folders for the folder: In the example shown below, the folders at the same level as the folder ( Personal, Receipts, Travel and Work) correspond to Gmail labels. Similarly, if you move a message to a folder in Thunderbird, Gmail will create a label with the folder name and assign it to the message.
When you apply a label to a message in Gmail, Thunderbird creates a folder with the same name as the label and stores the message in that folder. In this implementation, Gmail labels become Thunderbird folders. Gmail uses a special implementation of IMAP. Subscribing to folders and synchronizing messages Understanding Gmail labels and Thunderbird folders The Archive options… button is disabled for Gmail accounts, as it is not necessary to define the archive granularity with Gmail.