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Hidden Legacy System Dependencies: How to be Free of ThemLegacy systems stay in enterprise workloads for a long time in undisclosed manners. Even when you move to a new system, hidden dependencies show up, sometimes expectedly, sometimes unexpectedly. These could be technical, operational, or business-related.
Legacy system dependencies can appear through processes, reports, security and compliance, or workflows. It is worse if institutional knowledge hidden in the minds of long-retired employees is involved, as there is no way to retrieve them.
However, there are ways to address them, dealing with each problem as is fit for the company and its employees, from the C-suite to technical personnel. While this is important, you also need to choose a software for the migration process. Stromasys leads the way with Charon.
ArticlesLegacy systems are present in every organization, from business enterprises to government bodies. It is not that IT leaders are keen to stick with aging hardware or software; they cannot make such a change at the blink of an eye.
This is because mission-critical operations depending on legacy systems cannot be paused. A migration takes time, effort, and expenses. The transition needs to be smooth while keeping customer-facing systems operational to prevent any significant churn.
After all, acquiring a new customer is 5-25 times more costly than retaining one, as reported by Artisan Strategies. While the migration can be figured out, there are hidden factors that cannot be.
Yes, we are talking about legacy system dependencies. We think the ones we locate easily are the ones we need to address, but there are more such dependencies than you can think of. A legacy report detail that is necessary for an audit. An undocumented process requirement everyone follows but no one knows why. Or a compliance rule that requires an old data that’s needed only during audits
Think about this: Dell reported that Fortune 5000 companies use over 70% of software developed about 20 years ago or more. Anything that came after, be it software or hardware, got mixed in their activities.
The dependence on legacy systems may have increased with time, but the lack of interconnectivity and automatic documentation mean that none of it was registered in a permanent way. The crude process makes migration difficult and uneven.
This blog looks at why and how these dependencies keep legacy systems alive and how they can be solved. First, however, we will shine a light on the kind of hidden dependencies faced by the people in a company.
Are you addressing the challenges of owning a legacy system the right way? Find out now.
Before learning the details about invisible legacy system dependencies, we must learn what they are defined as. Legacy systems are old, so they were adopted early too. Some were taken over 30 years back. Over time, newer applications and processes develop around it; teams and even departments come to rely on it.
This creates dependencies. Anything that came after it now depends on the legacy hardware or software for operations and data. It creates legacy infrastructure dependencies that cannot be broken or severed easily. This web is the reason why entering entirely to a new system is so complex and requires careful deliberation.
Dependencies exist throughout your enterprise. However, the best way to tackle them is to understand which category they fall under. Basically, we observe three types of legacy infrastructure dependencies, which include:
These refer to components or tasks which cannot be completed until a legacy system signs off on it at the code level. It may be invisible to you, but it is happening; it is built into the architecture or design of the system.
For example, your application is working because of a legacy API. You could replace the API, but are you sure everything affected by it will still run normally? Not knowing equates to a complication a few months after modernization.
There are also processes or services that rely on an action by a legacy system to maintain their daily operations. You can easily observe them, but do not realize that a legacy system was behind it.
Such dependencies are necessary to ensure business continuity. An automatic order to the logistics department to deliver raw materials to the manufacturing line happening through a legacy software is noticeable, but not easily replaceable.
These are legacy application dependencies that affect strategic or organizational activities. People continue using these systems because a complete migration cutting off all dependencies would affect the business in areas where other people or organizations are involved.
Here’s an instance: there is a custom-built legacy system in the company which only a few people know how to fix. These people are retired or have passed away. What happens when there is a problem and you have no idea how to repair it?
Maintaining such legacy system dependencies is tough, but they cannot be ignored. A migration or replacement often raises an issue a few weeks later but solving them then is hard work and generates losses.
Legacy system dependency mapping is easy—until something unexpected comes up, and you realize you did not register it. In the ye olde days, dependencies were documented far less than now. Hence, they are hidden in the modern age.
Here’s five hidden legacy system dependencies that must be dealt with as modernization takes effect:
The dependence on legacy systems arises from processes that utilize data stored in them. Many integrations, scheduled operation, and manual tasks that use the legacy application still exist. They were never reported, but that does not mean they don’t keep the business processes running.
According to various organizations and analysts, unstructured data prevails in 80-90% of enterprise. It becomes a major roadblock for enterprises that wish to adopt modern technology like AI, automation, and the cloud.
Unfortunately, what was never recorded, only remembered, still retains vital information necessary to run the company. Before any replacement or rebuilding decision is made and steps to retire the system is started, every possible dependency must be checked and considered before deliberate removal or replacement.
Legacy system dependencies have another place that needs them: reports. Going back to an old spreadsheet or account is natural when you require an old data item or check for a discrepancy.
In fact, it is a major issue if the new reporting software or dashboard provides data that does not match the old one. You can only remove legacy application dependencies once every historical data has been lifted from it to the new application and accuracies verified.
This is important; 87% of operations leaders consider poor data quality as the reason why the success of the digital initiatives of their organization has been affected. Do not let this become a trend for yours.
Legacy system dependencies extend to security and compliance as well. Sudden decommissioning is impossible for outdated systems that provide authentication, authorization, and certificate management for other applications.
The same is true for compliance. Audit trails and transaction logs are necessary in their original format. Regulators often ask for them when modern processes and applications answer with legacy data. In fact, you even resolve supplier and customer questions and disputes by going back to legacy data.
The Check Point Q1 2025 Global Cyber Attack Report observed that compared to the same period in the previous year, there was a 47% rise in the average number of cyberattacks. The number equated to 1925 per week. We can say with confidence thar legacy systems and their dependencies were a major cause of them. Only with slow but decisive changes can you be truly free of legacy dependencies while shifting records to modern platforms.
Imagine a customer segment or a product that was handled using legacy software. You moved on to a new application, but historical knowledge exists only in the legacy system. A lone process step here or a status check there – these only happen because you are not completely free from legacy infrastructure dependencies.
Consider the finance sector. A bank spends years updating a customer’s details and money records. Even after moving to a new system, some information remains on the legacy network and can only be accessed through it. That is why, according to McKinsey & Co., legacy maintenance takes up 70% of their IT investments.
The best solution is to discuss every instance of the aging system showing up, whether through legacy system dependency mapping, detection of employee quick fixes, or accidental discoveries. You can then find ways to remove them through replacement or cleansing.
Legacy system dependencies matter a lot when historical data is involved. While some of them must be retained or archived for legal or compliance reasons, the question remains whether you should remove the rest or not.
It is worse for knowledge held by employees who have now retired or passed away. Undocumented business logic, unwritten customizations, and exception-handling procedures are present only in the minds of people no longer associated with the company
As an example, take COBOL programmers. According to Reuters, they are nearing the age of 50, or above, meaning that they are in the later stages of their career. It is hard, and honestly useless, to find replacements, as COBOL used to be taught widely during the 1980s. Use timely KTs and employees with specialized knowledge if you want to avoid such issues.
All these dependency problems are irreversible in theory, but not in practice. You just need the right solutions and the right steps to make it happen.
Legacy dependencies are hard to locate. Sometimes it’s the system, sometimes it’s the people. Here are some surefire ways to prevent tragedies uncalled for:
Modernization will be slow, but it will be planned and careful.
How likely is your hardware to fail? Not at all, extremely critical, or somewhere in between?
Your dependence on legacy systems, especially hardware, is the reason modernization comes near but never touches you. We have a solution that gives you time, saves your money, and allows for a slow, thoughtful transformation process.
We bring you Stromasys, the foolproof plan to an enterprise with operations free of legacy system dependencies. Using lift-and-shift emulation, it reproduces the original legacy hardware environment on a modern platform or the cloud.
It uses its flagship product Charon to recreate the software ecosystem of SPARC, PA-RISC, VAX, AlphaServer, and PDP-11, that allows their software to keep running while the hardware is replaced. The OS and applications see no difference before and after the emulation process.
Charon Emulation
You get the time to prepare for your migration and do away with legacy system dependencies without the need for haste or emergencies. Make your transformation a well-thought-out process with zero exceptions.
Orange Business had a unique problem—its Tungsten Markview Supplier Invoice Management system became outdated and only ran on Oracle Cloud Infrastructure with Solaris OS. Their ERP operations were at risk due to this.
Stromasys found a way for them. Charon-SSP was used to migrate their business to OCI. The results were fabulous, with complete business continuity and streamlined operations with no effect on performance. This means legacy system dependencies did not cause a problem either.
Legacy system dependencies are why organizations are highly troubled in maintaining operations through their modern platforms. Leaving these dependencies entirely is strenuous, and instances come up at odd moments of their legacy system still pulling strings.
A planned migration is about the execution of the modern system and decommissioning the outdated one. Yet, getting rid of legacy system dependencies is as tough and long-lasting as the migration itself. Careful planning and precision are necessary for the complete process.
Need time and patience for your operations to be free of legacy system dependencies?
While most legacy system dependencies are taken care of in the beginning of the migration to a new system, some remain. It can be employees unwilling to switch to a new platform or dependencies showing up suddenly in a software requiring a sign-off or a compliance report. The exact time depends on the people and the legacy application.
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