This document discusses Gmail's tabbed inbox and its potential impact on email engagement. It outlines the pros and cons of tabs, such as pre-qualified recipients in the promotions tab but possible latency in opens. It also shows how some brands are addressing tabs through dedicated messaging and instructions. While consumers report tabs haven't changed their email habits, data suggests engaged users are reading more and placement is up for medium/low engaged users. It's advised to monitor key metrics for Gmail subscribers and include dynamic language for them.