The Salesforce chief said he is still on good terms with Microsoft CEO Satya Nadella, but has a major beef with some of his executives.
"I'm cool with Satya for sure, but some of his executives however, I am not cool with because they have made some very aggressive statements about what they are going to be doing with this LinkedIn data," Benioff said Wednesday on CNBC's "Mad Money"
"It's amazing what they have said. And they are doing things that are absolutely anti-competitive, and that's what I wrote on Twitter."
In those late September tweets, Benioff called out Microsoft Executive Vice President Scott Guthrie in particular, saying the product maker and Microsoft would use LinkedIn data for "anti-competitive bundles" and deny data access to rivals.
Microsoft declined to comment.
Earlier this year, Salesforce, a cloud computing company that offers services to help companies keep track of interactions with customers, was pursuing a purchase of LinkedIn. However, in June, Microsoft announced it would buy the social platform for $26.2 billion.
Salesforce has raised concerns that Microsoft will be able to deny competitors use of LinkedIn's mass collection of user data giving the company an unfair advantage.
— CNBC's Regina Gilgan contributed to this report.