Salesforce is celebrating its 20th anniversary today. The company that was once a tiny irritant going after giants in the 1990s Customer Relationship Management (CRM) market, such as Oracle and Siebel Systems, has grown into full-fledged SaaS powerhouse. With an annual run rate exceeding $14 billion, it is by far the most successful pure cloud application ever created. Twenty years ago, it was just another startup with an idea, hoping to get a product out the door.