Microsoft's partners serve as consultants and technical gurus for many businesses, customizing and deploying software inside companies and organizations.
Microsoft said the upswing highlights how companies and their employees are adapting to work that centers on team collaboration and channel-based communications.
Microsoft's announcement that Microsoft Teams hit 19 million weekly active users is also impressive but is harder to compare as Slack's weekly user numbers aren't in the recent SEC filing.
"Microsoft Teams will create more opportunity than anything we've ever had in this productivity space", Spataro said. Note that in January, Teams only had about 8 million daily active users - indicating that it's only picked up the pace since Slack made its announcement.
Recent reports, however, suggest that the Microsoft's sales teams is focusing on getting people to use Teams over the course of the next year, so we could see Microsoft pull even further.More news: Trump unloads on Paul Ryan, calls him 'a lame duck failure'
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Most of the companies using Slack also favor Google G Suite for day-to-day office tasks, while those relying on Microsoft Office products are mostly Teams users by default because Microsoft bundles Teams with its Office 365 subscriptions for all business clients. This means that plenty of companies large and small have access to Teams as part of a service that they're already paying for, which could give a leg up.
"We are excited to announce that several of our core products are in the process of becoming certified for Microsoft Teams", said Chris Merrick, director of global systems marketing at Shure.
Another addition, available later this month, is the "Priority notifications" which will ping a recipient every two minutes on their phone or desktop until there's a response. Also coming this month will be a "Read Receipts" feature in chat, letting a user know a message was read. These features will roll out this month.
Microsoft - which reportedly considered a multi-billion-dollar acquisition bid for Slack before developing its own tool - has thrown significant resources behind Teams and has quickly built out new features to cater to a wide range of uses. This feature is now available. Moderators can also manage what is posted in channels and if posts can have replies.
"What we see is that a lot of our clients have deployed version one of their Teams, where the deployment is really nearly a straight replacement for Skype", La Palme said.