[15] In 2001, Mike Cannon-Brookes sent an email to his University of New South Wales classmates asking if any of them were interested in helping him launch a tech startup after graduation.

[20] The name was derived from the Greek mythological figure Atlas,[21] inspired by his bronze statue in New York's Rockefeller Center.

[27] The 2014 restructuring saw the parent company became Atlassian Corporation PLC of the UK whose address was registered in London though the de facto headquarters remained in Sydney.

[38] Their building is planned to be the world's tallest hybrid timber structure and will embody leading sustainability technologies and principles.

[40] In October 2023, Microsoft identified a severe zero-day vulnerability that can be exploited remotely and anonymously in Atlassian's Confluence product.

It also accused Chinese state-backed group known as Storm-0062, DarkShadow, or Oro0lxy, of breaking into Atlassian customers' systems several weeks earlier.

[43][44] Branding itself as the "God mode for the internet," NA granted its free and paid members the ability to access real-time Jira and Confluence data from Atlassian's cloud and on-premise products, impacting thousands of Atlassian customers including Reddit, FireEye, NBC Digital, BuzzFeed, AlienVault, Cardinal Health, T-Mobile, and Under Armour.

[45][46] Ars Technica's coverage of Jadali's findings highlighted DataSpii's ability to disseminate sensitive Atlassian Jira data, including Blue Origin staff's competitor discussions and technical issues with sensors, equipment and manifolds.

DataSpii circumvented the most effective security measures, enabling the unauthorized dissemination of Jira data from the internal corporate networks of leading cybersecurity firms.

This was considered risky in the early 2000s, but the strategy worked better than expected when they awoke one morning to an order form from American Airlines in the fax machine.

[52][53][54] Additional products include Crucible, FishEye, Bamboo, and Clover, which target programmers working with a code base.

[73] On 12 May 2020, Atlassian acquired Halp, a tool that generates helpdesk tickets from Slack conversations,[74] for an undisclosed amount.

[75] On 30 July 2020, Atlassian announced the acquisition of Mindville, a provider of IT service management software, for an undisclosed amount.