The days of Slack dominating the workplace collaboration market may be over, as a new poll finds that Microsoft Corp.’s Teams has passed it in popularity.

The finding comes via a survey of 901 organizations undertaken by Spiceworks. The poll found 21 percent of businesses now use Microsoft Teams in their workplace, versus only 15 percent using Slack. The most popular app was found to be another Microsoft product: Skype for Business, coming in 44 percent.

Microsoft Teams launched with much fanfare out of a closed beta test in March 2017, but even before it became widely available, a Spiceworks survey in January 2017 said it would surpass Slack in usage in two years. Teams managed to do so with one month to spare.

Moving forward, the adoption rate of Microsoft Teams is even rosier. The survey found that by the end of 2020, 53 percent of businesses plan to use Skype for Business, 41 percent plan to use Microsoft Teams, 18 percent will opt for Slack and 12 percent will go for Google Hangouts.

Barely even considered as an afterthought, only one percent of organizations said they planned to use Workplace by Facebook.

“The sudden rise of Microsoft Teams is likely influenced by the fact that it’s available at no additional cost to Office 365 users,” Peter Tsai, senior technology analyst at Spiceworks, said in a statement, referencing Microsoft’s decision to offer a free version of Teams in July.

“Although Skype for Business has maintained the lead overall, Microsoft is putting more of an emphasis on Microsoft Teams as the default communications app for Office 365, which is enticing organizations to give it a try,” he said. “As a result, we’ll likely see Teams adoption rates double in the next couple years.”

Slack’s waning popularity comes as the Stewart Butterfield-led company staggers toward an initial public offering. According to a report Sept. 28, Slack was looking to go public in the first half of 2019 on a valuation “well in excess” of $7 billion. A more recent report pegs the figure at above $10 billion.

Butterfield may be fondly remembered for his days as the co-founder of Flickr, but with Microsoft now beating Slack at its own game, the IPO may have been left too late to maximize returns for investors.

Image: Microsoft