Gmail now offers users the ability to switch between conversation view and the traditional message-based unthreaded view. When a user switches to unthreaded view in 'Settings', messages are no longer grouped together into a conversation, and each message is shown as a separate entry in the inbox.
Read more about unthreaded conversation view in this blog post
Priority Inbox is a new, alternative view of your Gmail inbox that helps solve the problem of email overload. With Priority Inbox, Gmail automatically identifies your important email and separates it out from everything else, so you can focus on what really matters.
Google Mail Labs feature: You can enhance the starring feature by enabling the Superstars lab in your account settings. This experimental feature allows you to use different types and colors of stars by toggling through a handful of icons, giving you another way to prioritize and flag your email.
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