Walmart has chosen Microsoft as its cloud services provider of choice to improve the former's forecasting, purchasing, and data sharing abilities. While both the companies clearly share a rivalry with Amazon, this 5 year deal helps Walmart increase its market share in the US and also streamline its delivery system.
https://www.notebookcheck.net/Microsoft-and-Walmart-team-up-to-take-on-Amazon-s-cloud-and-retail-business.316622.0.html