Postbox -- based on technology developed by Mozilla -- is aimed at users looking for new ways to organize, locate and use the data that's sent to them by e-mail. The software will automatically detect, analyze and catalog all that data, whether it's text, documents, images or Web site URLs. Postbox then builds a searchable catalog that can help you retrieve or navigate to that data when you need it.

The Postbox application includes features like a Compose sidebar panel that lets you find attachments, images and links; an Inspector pane that helps you to look for interesting content in each message; Contacts panel to get access to address book data; tabbed mail browsing; message view by "conversation," arrangement by topics; quick tagging which applies metadata to all the messages in a conversation; a dedicated Archive folder; to do list management.

Postbox 1.0b7 requires Mac OS X 10.4 or later.