The latest version of Thunderbird jumps from version 3 to version 5, matching its sibling Firefox as it joins Mozilla's rapid-release program. Thunderbird 5, available to download for Windows, Mac, and Linux, is mostly a bug-fixing release that improves stability. It also shortens and improves the workflow for adding new e-mail accounts.

Watch what the program's got, and what it lacks, in this new First Look video.