Slack of chat service bought Atlassian's competitive service, is it a step to compete against Microsoft?

We announced that Slack Technologies, which operates the company's " Slack " chat service, will acquire " Hipchat " and " Stride " competing services operated by Atlassian . Atlassian urges users of Hipchat and Stride to transition to Slack.

Atlassian + Slack | The Official Slack Blog
https://slackhq.com/atlassian-and-slack-partnership

Atlassian + Slack | Atlassian
https://en.atlassian.com/partnerships/slack

Slack buys Hipchat with plans to shut it down and migrate users to its chat service - The Verge
https://www.theverge.com/2018/7/26/17619482/slack-hipchat-acquisition-stride-atlassian-partnership-microsoft-teams-competition

The reason Slack, which has established a major force in the enterprise chat service, has come up with such a possibility is believed to be the free edition of Microsoft's enterprise chat service " Microsoft Teams ."

Slack also has a free plan, but there is a danger that users will be released by offering a free version of competing Microsoft Teams. As a result, we are trying to incorporate competing service users into our company.

Originally, Slack and Atlassian were "in a fiercely friendly competition " relationship, with Atlassian's task management service " Trello ", project management service " Jira Cloud ", distributed version management solution " Bitbucket Cloud " It is integrated with Slack, and we will further deepen integration and will also integrate new products with other products in the future.

According to Atlassian, Hipchat and Stride are scheduled to be out of service in February 2019.