Thunderbird provides the ability to archive messages - that is, to move them from the default folders into an dedicated archive folder that's residing either in your online mailbox or in a local folder. This makes it easy to keep the inbox clean and can also help you from reaching your mail server's quota limit by moving archived messages onto your local device. Archived messages are still indexed by Thunderbird's search.

How do I archive my messages?

Messages can only be archived manually, not automatically. To archive one or more messages, select the desired messages and then click on the Archive button, or simply press A on your keyboard. It is recommended that you not select more than 2,000 messages at a time.

How do I configure archiving?

Configure archive location

The location of archived messages can be configured individually for each email account. Click the Thunderbird menu button ≡ and choose Account Settings. On the accounts pane, click Copies & Folders under the desired email account in the left panel. In the Message Archives section, use the settings in Keep message archives in to set the location of the archive (either in your online mailbox or in a local folder) or to disable the feature altogether.

Configure archive folder structure

You can define the structure of the archive folder by clicking the Archive options... button in the Message Archives section. There you can choose if you want to keep all your archived messages within a single folder, or file them into yearly or monthly subfolders. It's also possible to keep the original folder structure of your messages when they get archived.

Multiple identities per account

If you have set up additional identities for an email account, the archiving location and folder structure can be configured separately for each identity.