Shared Gmail Labels help you collaborate with your team-mates by sharing email conversations with them. If you share a Gmail Label called “New Lead” with your team-mates, when whenever you add that label to an email in your Gmail inbox, the email appears in your colleagues Gmail accounts too with the label “New Lead” attached.

This works no matter what email client you and your team might be using. If you are using an email client like Outlook, Thunderbird or email on your mobile device, the label you are sharing would appear as a folder in the email client.