Salesforce CEO Marc Benioff slams Microsoft over "horrible things" it did to Slack, warns OpenAI could be next to suffer

• Salesforce CEO Marc Benioff claims Microsoft did "horrible things" to Slack before its acquisition
• Benioff accused Microsoft of running its own playbook
• The OpenAI partnership could be turning into a competition

Salesforce CEO Marc Benioff has criticized Microsoft's history with Slack, warning it may repeat its anticompetitive tactics used against the online collaboration platform in its partnership with OpenAI.

Benioff declared Microsoft had done "horrible things" to Slack before Salesforce acquired it in 2020, referring to a "playbook" of things it could reopen to the detriment of OpenAI.

Slack submitted a complaint against Microsoft for its bundling of Teams into the Microsoft 365 suite – which was undone in 2024 – but that clearly hasn't stopped Benioff from wanting to get the last word.

Salesforce's fight with Microsoft continues

Speaking to SaaStr CEO Jason Lemkin in a recent video podcast, Benioff explained: "You can see the horrible things that ...