Postbox is free desktop e-mail software that's closely integrated with various Web apps and services. Once it's been connected to these outside services, it can easily open up attachments in other pieces of software or Web applications when clicking on things like addresses, phone numbers, and certain file types.
Similar to Mozilla's Thunderbird, Postbox has taken a tabbed approach to e-mail, allowing you to have several tabs open at once with various e-mail tasks running inside of each one. It also includes a to-do-list manager, archiving tool, and tagging system to let you organize and sort your mail quickly.
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