If you applied for an Inbox Invite earlier this week you should now have your invitation to join. Inbox aims to be a fresh approach to email. This is the inbox that works for you. The design team took what they learned from Gmail and applied it to this all new approach to email. Inbox bundles types of eamils together (ie promos with promos, purchases with purchase, travel with travel ect.) This makes it easier to find what you are looking for. You can also create your own custom bundles. Inbox gives you your highlights at a glance so you don't have to scroll through endless useless emails to get to the important stuff. Reminders allow you to add notes to the top of your email so you don't forget. You can "snooze" messages for later. This is better than just dismissing the notification which can lead to you forgetting to respond. Once you have snoozed an email it will re notify you at that later time so you don't forget to respond. The list of features just goes on and on. If you have already requested an invite it should be in your inbox. Install the app from the invite, sign in using the same email you received the invite with, it should auto populate your unique code, if not there is a place to enter it in the app. Head to the link below to request your invite.
Via Google