If you're looking for a more Gmail-like experience in Thunderbird 3.3 alpha, a new add-on should be able to help you out.
Dubbed Thunderbird Conversations, the add-on offers a conversation view in the e-mail program, allowing users to have all their messages to and from another party in one place, similar to Gmail. The app "fetches" e-mails across every folder in the user's Thunderbird installation. Users can reply to an e-mail inline, and access the add-on's "contacts auto-complete" feature to streamline its use.
Thunderbird Conversations was first made available at the end … Read more