7 min read

Why Are Legacy Systems Still Used?

Legacy systems remain an important part of many businesses, even in the face of modern technologies. While they may present certain challenges and risks, there are also many reasons why businesses continue to use them, such as their reliability and specialized functionality.

Tim Davidson
Tim Davidson

In the fast-paced world of technology, businesses often strive to stay ahead of the curve by adopting the latest technology standards and systems. In fact, adopting a new technological trend in your business model often sounds ‘cool’ in marketing materials and may actually attract investors and customers. But despite the allure of the shiny new tech trends/systems, many businesses continue to rely on legacy systems that have been in place for decades. Some even switch back to the traditional systems they had forsaken for the new ones.

In this article, we will explore the reasons why legacy systems are still being used, the challenges associated with them, and strategies for dealing with them. Technology leaders need to understand the reasons for legacy system usage to make informed decisions about modernizing or replacing these systems in their organizations.

Reasons for using legacy systems

Reasons for using legacy systems

Legacy systems are technology systems, software applications, or hardware infrastructure that have been in use for a long time and are generally considered obsolete. These systems are often critical to the operations of an organization, but they are outdated and lack modern features and capabilities. They may also be difficult to integrate with newer technology or software applications.

Despite their limitations, many organizations continue to use these systems primarily due to the following reasons:

Cost of transitioning

Switching from your IT legacy system to a new and modern one is usually expensive and time-consuming. In the long haul, the modern system can save you more money than your traditional system. But its initial cost including installation/integration, backfilling, and training your employees on how to use the new solution can be challenging especially if you’re on a budget.

Legacy systems still fulfill a need

One of the main reasons why organizations continue to use legacy systems is that these systems still fulfill a critical business need. These systems may have been developed to meet specific business requirements, and over time, they have become an integral part of the organization's technology infrastructure. Replacing them with newer systems can disrupt business operations. Besides, why shift to a new system while your existing systems work just fine and meet all your business needs?

Ease of maintenance

It's easy to maintain your existing system since your business has grown into it. Your internal team has already developed specialized skills and knowledge over time, making your employees highly efficient in resolving any issues that may arise with the legacy systems.

In addition, as a business, you may have established relationships with third-party vendors that provide ongoing support for legacy systems. These vendors may offer maintenance, upgrades, and support services that enable your business to continue using their legacy systems without disruption.

Customization and specific functionality

Legacy systems may have been designed to meet specific business needs and may have customized features that are not available in newer systems. This makes it difficult for a business to move away from them, particularly if their business processes are dependent on these unique features.


Legacy systems have been in use for a long time and have been integrated with various other systems, databases, and applications that are currently in use. These systems have been customized to work with specific hardware, software, and applications, and they may not be easily replaced without disrupting the existing ecosystem.

Replacing legacy systems can also require significant investment in time, effort, and resources to ensure compatibility and interoperability with existing systems. In contrast, using legacy systems that are already integrated with the existing ecosystem can be a more cost-effective solution that reduces the risk of disruption to critical business operations.

Challenges of using legacy systems

Challenges of using legacy systems

The fact that legacy systems are outdated and lagging behind technological advances makes them vulnerable to a myriad of problems. Some of the potential risks associated with using legacy systems include:

Maintenance and support challenges

As legacy systems age, the vendor may stop rolling out updates and offering support, and in some cases charge a premium for offering support for systems that are no longer part of their product offering.

Security vulnerabilities

Legacy systems are often built using outdated technology, making them more vulnerable to cyber-attacks. These systems may lack the necessary security features to protect against modern threats, leaving them exposed to potential data breaches and other security issues. In addition, legacy systems may not receive regular updates and patches to address security vulnerabilities, making them even more susceptible to cyber-attacks.

Inefficient in the modern business landscape

Legacy systems may not be able to keep up with the dynamic customer needs. So, they may fail to handle the increased demands of modern business operations. As organizations grow and expand, legacy systems may become a bottleneck, limiting their ability to process data or handle increased traffic. This can lead to decreased efficiency and productivity, as well as potential disruptions in business operations.

Compliance challenges

As regulators continue to formulate new laws to keep up with modern technologies, legacy systems may not be compliant with modern regulations and standards. This may attract legal and financial risks for a business. In addition, legacy systems may not be able to generate the necessary reports and documentation required to comply with regulations, making it difficult for businesses to demonstrate compliance.

Strategies for dealing with legacy systems

While some businesses may choose to continue using legacy systems, others may find it necessary to modernize or replace these systems to avoid potential risks and limitations. Here are some common strategies that businesses can use to deal with legacy systems:

Evaluation of risks and benefits

Before choosing to adopt modern systems or keep the existing ones, you must first evaluate the risk and benefits of both systems. In most cases, upgrading to a modern system will likely streamline your business operations and even improve customer experience. However, these benefits come at a cost as you have to incur a significant expense of integrating the new system. Keeping the old system denies you a competitive advantage in the business landscape in addition to other risks such as security vulnerabilities and lack of scalability. In consultation with your internal team, you should weigh both systems to get a sense of which one aligns best with your business needs.

Modernization through updating or replacement

Modernizing legacy systems by updating or replacing them can help businesses overcome the limitations associated with older technology and stay competitive in today's fast-paced business environment. Upgrading legacy systems can involve replacing outdated hardware, software, and other components to improve functionality, security, and scalability.

This update can be done incrementally in a phased approach rather than overhauling the entire system at once. This approach can help businesses manage costs and minimize disruptions to business operations

Hybrid solutions

Hybrid solutions involve using a combination of legacy systems and newer technologies. You get to enjoy the perks of both systems. For example, businesses may choose to keep critical legacy applications in place while using cloud-based systems to support other aspects of their operations. This approach can help businesses leverage the benefits of both legacy systems and modern technology while minimizing disruptions to business operations.

The Future of legacy systems

As technology continues to advance, the future of legacy systems may seem uncertain. However, it doesn’t mean that these systems will suddenly disappear into oblivion. They have been a critical part of the technology landscape for decades, and they are likely to continue to play an important role as a bridge between old and new technologies. This can be achieved in these ways:

Data integration

Legacy systems can be used to integrate data from older technologies with newer systems. For example, a company may use a legacy database to store customer data and then integrate that data with a newer CRM system to provide a more comprehensive view of customer activity.

Application programming interfaces (APIs)

APIs can be used to connect legacy systems with newer systems, allowing them to exchange data and information. This can be especially useful for businesses that need to maintain legacy systems for other reasons but still want to take advantage of the latest technologies.

Web services

Legacy systems can be exposed as web services, which can then be used by newer technologies. This approach can help to extend the life of legacy systems and make them more compatible with newer technologies.

System orchestration

System orchestration refers to the process of coordinating the flow of data and workflows between different systems. In the context of legacy systems, this can involve using a legacy system to act as a central hub that manages and synchronizes data between different systems, including newer technologies/systems.

Frequently asked questions

Q: What is a legacy system?

A legacy system is an outdated technology or software that is still in use by an organization. It is typically a system that has been in place for many years and may no longer be supported by the original vendor.

Q: Why do businesses still use legacy systems?

Businesses still use legacy systems for a variety of reasons, including the high cost of replacement, the need for specialized functionality, and the fear of disrupting critical business operations.

Q: How can businesses determine if it's time to modernize their legacy systems?

Businesses can determine if it's time to modernize their legacy systems by evaluating the costs and benefits of modernization, assessing the risks associated with their current systems, and identifying opportunities for improvement.

Key takeaway

Legacy systems remain an important part of many businesses, even in the face of modern technologies. While they may present certain challenges and risks, there are also many reasons why businesses continue to use them, such as their reliability and specialized functionality. By understanding the pitfalls of legacy systems and exploring strategies for modernization, businesses can continue to leverage the benefits of these systems while also staying competitive in today's fast-paced business environment.

Written by
Tim Davidson

Tim Davidson

Tim is the face of the company. When you want to kick off a new project, or an update on your existing project, Tim is your man!

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