Our roving video reporter Rex Moore recently visited a real cloud in order to highlight the investing opportunities involved. Now, Rex digs deeper into the stocks involved in a five-part series with cloud expert Max Keeler. Today, Rex and Max talk about the big battle over the software that controls the cloud.

Rex Moore owns shares of eBay and Microsoft. Max Keeler owns shares of Amazon.com. The Motley Fool owns shares of Amazon.com and Microsoft. Motley Fool newsletter services recommend Amazon.com, eBay, Microsoft, and Rackspace Hosting. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.