Here's a list of Microsoft's announced acquisitions: https://www.microsoft.com/investor/Stock/AcquisitonHistory/All/default.aspx https://www.microsoft.com/inve

Here's a list of Microsoft's announced acquisitions: https://www.microsoft.com/investor/Stock/AcquisitonHistory/All/default.aspx https://www.microsoft.com/investor/Stock/AcquisitonHistory/A... (warning, asked for an MS Login first) From their results from previous acquisitions, I don't understand what they think they would get by purchasing Slack (unless it is a purely defensive move against Slack developing an in-house document collaboration service, Office 365/Google Docs style).