Today we’re excited to graduate three more features from the experimental testing ground of Gmail Labs. Superstars, Nested Labels, and Advanced IMAP Controls are now first-class citizens in the Gmail world, thanks largely to your feedback. We’re also retiring the Google Search box lab which was redundant with the “Search the Web” button that’s already in Gmail.

Superstars, one of the most popular Labs features, provides different types of stars in addition to Gmail’s basic one. You can assign a certain star to special conversations and use another as a visual reminder that you need to follow-up on a message later. You can now choose your own set of stars from Settings:

Once you’ve done that, the stars will rotate with each consecutive click on the star icon.

Nested Labels
Labels are a great way of organizing your email; nested labels give you the ability to organize labels hierarchically. Starting today, nested labels are enabled for everyone along with a couple of small improvements such as a sticky collapse/expand state and better editing options.

To start using them, you can either create a new sub-label from the dropdown menu on the left hand side or just move an existing label under another one using the edit option:

Advanced IMAP Controls
This Labs feature provided a very useful set of advanced controls for those of you who access Gmail through IMAP clients (e.g. Outlook, Thunderbird, or your iPhone’s native mail app). Now it’s easier to take advantage of features like syncing only selected labels or limiting the folder size limit to improve your IMAP experience.

True to the original spirit of Gmail Labs, we’ll continue to add new features, graduate some, and retire others, so keep trying them out and sending us your feedback.