With the launch of the new Gmail, the writing was on the wall, but today Google made it official: Inbox by Gmail, the company’s experimental email client for Gmail, will shut down at the end of March 2019.

Google says it’s making this change to put its focus “solely on Gmail.” While that makes sense, it’s a shame to see Inbox sail into the setting sun, given that it pioneered many of the features that have now become part of the new Gmail.

I would have loved to see Google continue to experiment with Inbox instead. That, after all, was one of the reasons the company started the Inbox project to begin with. It’s hard to try radical experiments with a service that has a billion users, after all. Today, however, Google now seems to be willing to try new things right in Gmail, too. Smart Compose, for example, made its debut in the new Gmail (and many pundits correctly read that as a sign that Inbox was on the chopping block).

While the new Gmail now has most of Inbox’s features, one that is sorely missing is trip bundles. This useful feature, which automatically groups all of your flight, hotel, event and car reservations into a single bundle, is one of Inbox’s best features. Our understanding is that Google plans to bring this to Gmail early next year — hopefully well before Inbox shuts down.

So there you have it. Inbox for Gmail will shut down in six months, but I wouldn’t be surprised if Google resurrected the idea in a few years to try some other email experiments. Until then, here is Google’s guide to moving from Inbox to Gmail.