Inbox by Gmail (a separate email interface) has been a place that Google used to experiment with new ideas like snoozing emails to later, as well as to try the latest AI-powered experiences like Smart Reply, Nudges, and high-priority notifications.
Four years after launching Inbox by Gmail in 2014, Google has taken several popular Inbox experiences and added them into Gmail. Google is now planning to focus solely on Gmail and will discontinue Inbox by Gmail at the end of March 2019.
Many on campus fell in love with Inbox by Gmail, so to make this a bit easier, Google created a transition guide to help switch from Inbox by Gmail to the new Gmail. All of your conversations are already in Gmail.