Tabs
If you like Firefoxs tabbed browsing, youre going to love tabbed email. Tabbed email lets you load emails in separate tabs so you can quickly jump between them. Perhaps youre responding to an email and need to refer back to an earlier email. Tabbed email lets you keep multiple emails open for easy reference.
Double-clicking or hitting enter on a mail message will now open that message in a new tab window. Right-clicking on messages or folders will open them in a tab in the background.
When quitting Thunderbird, visible tabs will be saved and will be restored when you open Thunderbird the next time. There is also a new Tab menu on the Tab toolbar to help you switch between Tabs.

Search
The new search interface in Thunderbird 3 contains filtering and timeline tools to pinpoint the exact email youre looking for. Thunderbird 3 also indexes all of your emails to help you search even faster. Your search results are displayed in a tab so you can easily switch back and forth to your search results and other email.

Message Archive
If you think youre going to need an email in the future but want it out of your inbox without deleting it, archive it! Archiving helps you manage your inbox and put your email into a new archive folder system.
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