According to a Google blog posted today, if you use Inbox, it will still be functional at least until the end of March 2019.
Google has made a decision to shut down its "Inbox by Gmail" app by March next year.
Google suggests users start using Gmail again which now features most of the tools originally found in Inbox. In the new experience, users can directly access actions on the emails within the Gmail inbox, snooze emails until a later time, send emails under a confidential mode, and more.
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For me, Inbox was an attempt to simplify email and while it certainly had some interesting features, Inbox was too simplified and not really usable because of that. A playground to try out all sorts of new features by way of helping people gey their cluttered inboxes under control, from smart replies to automatically grouping emails of certain kinds together.
The closure of Inbox was hinted at when Google rolled out the new Gmail to users earlier in the year. The company claimed that it had no plans to change its email client and saw it as a place to continue testing innovative features. Back in the day, the Gmail app or desktop experience would come with limited options, making Inbox by Gmail a platform to create/expand on ideas. In it, Google walks customers through using some of their favorite features from Inbox in Gmail as well as discover new ones.