Mozilla Thunderbird has lots of great features including search, customizable views, IMAP, RSS support and more.

Contacts Sidebar – displays the address books in Thunderbird sidebar. This lets you easily access all your contacts from the main window, quickly edit contact details, drop files on top of a contact to send it as an attachment and more.

GMailUI – is an extension to Thunderbird which add concepts inspired by GMail to Thunderbird, like archiving mail and powerful message searching across all folders. a folder to be your sole “archive” folder, or choose to have an archive folder in each of your multiple accounts.

Quicktext – is an extension for Thunderbird that lets you create templates that can be easily inserted into your own emails. Quicktext is the perfect tool to help you quickly answer routine, repetitive emails. The program can insert different signatures into your emails depending on whom you are sending the email to.
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Some Addons integrate search and bookmarking, others provide ways to view and take notes, some make minor, but wonderful adjustments…

All-in-One Sidebar If you like Opera’s sidebar but prefer to stick with Firefox, this add-on gives you the best of both worlds. Once installed, it gives you a panel at the left or right of the browser window which you can use to switch between each browser’s features. It lets you quickly switch between sidebar panels, view dialog windows such as downloads, extensions, and more in the sidebar, or view source or websites in the sidebar.

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