In 2016, Uber made an unexpected move and left Slack for Mattermost. The ridesharing company needed an enterprise-grade collaboration tool which Slack couldn’t scale. When Uber decided to create its messaging solution on Mattermost, both companies collaborated to implement an upgrade of Mattermost platform to meet Uber’s needs. Akamai, the world’s leading content delivery network service provider, has been using Zulip for remote collaboration with employees for many years.