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.
is the best way to send large files too big for email attachments to friends, family and businesses, anywhere in the world. SendSpace allows to send files up to 300MB.
allows you to send files up to 100MB without creating an account. Upon uploading a file to YouSendIt, an email is sent to the recipient, where they are given a link to download the file. The download is available for 7 days and includes advertising on the page.
is a leading provider of online storage. MegaUpload allows to send files up to 500MB, offers ad-financed free and affordable premium online storage, sophisticated uploading and downloading tools, and high-volume business accounts including pay-per-download. Read »
Feed Mailer allows access to RSS feeds through email. This is especially useful for those users that have limited Internet access or are in environments that prohibit certain computer use such as government or education institutions. It also enables less savvy hat are more comfortable with an email interface users to benefit from RSS feeds.