Applications, Databases, and Infrastructure Components

Which applications, databases, and infrastructure components do you think are mission-critical for an online retailer such as Amazon, Walmart, Target, and eBay?

You can also think about other organizations, such as social networking sites, banks, and financial institutions. When you indicate an application, a database, or an infrastructure component, you should provide the reasoning why it is mission-critical for that online retailer. How does hardware and software obsolescence affect organizations? Give examples of outdated hardware or software. How could organizations deal with these situations?