Cloud service vendor lock in is an issue that keeps CEOs and CIOs up at night. Vendor in lock (also called supplier or provider lock in) has existed in the IT industry and other industries for a long time. The problem is simple. An organization uses, and becomes dependent on the tools, technologies, processes, and services of a specific vendor. If you wish to change vendors, or you need to change vendors, you have to replace those tools, technologies, processes, and services you've become so dependent on. On top of that you have to retrain your people. It's a costly and time consuming proposition. The prospect is particularly stressful to CEOs and CIOs because it's not an "if," it's a "when." At some point, you will have to change cloud vendors. That means at some point you will have to deal with cloud vendor lock in. In this article, we'll look at the issues that can arise from cloud vendor lock in, and give you strategies to help you thoughtfully prepare, and mitigate problems that can arise.