What is a legacy system? Definition and challenges. Legacy systems are older devices, software applications, or infrastructure that are still in use today. While some organizations view them as reliable, using them comes with significant risks. Before we begin, be sure to subscribe to Ninja One's IT Video Hub for more tech content like this. What are legacy systems? Legacy systems are outdated technologies organizations continue to use in their operations. These systems are commonly found in industries like healthcare, banking, and manufacturing, where they're considered critical to daily operations. Adobe Flash, Microsoft Windows seven and the IBM mainframe are some examples of outdated systems that persist today. Legacy systems are characterized by age, outdated programming, languages, and lack of vendor support. They're often incompatible with modern hardware software. More importantly, they're difficult to use. Running these systems require specialized skills that only a handful of people still have. Challenges of using legacy systems, the biggest challenge of using legacy technologies is security. Since these devices no longer receive patches, they are highly vulnerable to modern malware. Outdated devices can also limit a company's ability to innovate. Most legacy systems are not compatible with today's hardware. Finally, there's the cost. Maintenance becomes more expensive over time, so the older your devices are, the more expensive their maintenance will be. With these drawbacks in mind, why do organizations continue to rely on legacy systems? For one, replacing them can be costly and risky. Some systems are so embedded in daily workflows that replacing them could cause major disruptions. Legacy systems also have proven reliability, making them safe bets. For critical tasks, companies know they can depend on them to perform without fail, so they choose not to upgrade them. Modernization strategies for legacy systems. Let's walk you through some of the most common modernization strategies for legacy systems. Replatforming. Moving an outdated system to a new environment with minimal code changes. Refactoring improving existing code base to enhance the system's stability and performance. Re-architecting, redesigning a system's architecture to make it compatible with current technologies, rebuilding, reconstructing an entire system from scratch, using up-to-date tools. Ultimately, organizations must recognize the risk of relying on aging technology and carefully weigh their options for modernization. For more information, check out our official blog post on migrating legacy systems linked in the description below.