Google Inbox alternatives

Google Inbox
Inbox by Gmail is a new app from the Gmail team. Inbox is an organized place to get things done and get back to what matters. Bundles keep emails organized.
Google Inbox alternatives are:
GMail, Dropbox, MS Outlook, Google Now, IBM Verse
Here are the latest news about Google Inbox:

2016 Google Inbox now helps you track calendar events

Google is launching an update to it's Gmail-based app Inbox. The most interesting new feature is that Inbox can now help you keep track of events and the emails you send back and forth about them. This feature is linked to Calendar invites, similar to how trip bundles are triggered by hotel or flight bookings. Google tells me this is based on the same technology that powers Inbox’s trip bundles, which pull all your hotel, flight, restaurant and car reservations into a single, shareable bundle.

2015 Google Inbox adds smart reminders and undo send option

2015 Google Inbox comes to iPad and Android tablets, Firefox and Safari

2014 Google unveiled its Email 2.0 service