Mozilla launched Thunderbird, its open-source email client, for PC and Mac ages ago. Two years after the organization announced plans to launch a mobile version, a client for Android is now available for download at long last, following the release of a beta version a few weeks ago. Thunderbird 8.0, which is built on the K9-Mail app, allows Android users to import settings and data from the desktop client to their phones and tablets. All you need to do is scan a QR code or transfer a settings file. K9 users can also seamlessly migrate settings, emails and folders. The Thunderbird app, which is…