Three new features which have been under development within Google Gmail Labs for some time have this week graduated from the confines of testing and are now available within standard Gmail accounts.
The new features that made the grade are Superstars, Nested Labels and Advanced IMAP Controls, but unfortunately there was also one causality with the retirement of the Google Search Box lab feature, which was added to the labs back in April 2009.
Superstars, one of the most popular Labs features, provides different types of stars in addition to Gmail’s basic one.
Nested Labels are a great way of organizing your email; nested labels give you the ability to organize labels hierarchically.
Advanced IMAP Controls provides 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).
Source : Google Gmail Blog