Legacy modernization services
MS-DOS modernization, Visual Basic migration (VB1–6, VBA, VB.NET), Delphi modernization (Delphi 1 through 12), .NET Framework modernization (2.0–4.8 to .NET 10), cloud-native transformation on AWS and Azure, hybrid solutions, legacy virtualization, and .NET Core application modernization for apps with a modern runtime but an outdated design.
MS-DOS Modernization
Convert QuickBasic, Basic PDS, Visual Basic for DOS, and Turbo Pascal to C# .NET, Go, Rust, or Delphi.
QuickBasic · Turbo Pascal · Basic PDS · VB-DOS
Visual Basic Migrations
Upgrade Visual Basic 3/4/5/6 applications to cloud-ready solutions with C# .NET, Go, or Rust.
VB6 · COM · ActiveX · .NET 9
Delphi Modernization
Transform Delphi applications for modern environments and the latest operating systems.
Delphi 2–7 · XE · VCL · BDE → FireDAC · Win64
Legacy .NET Framework
Upgrade aging C# and VB.NET applications built on .NET Framework 2.0–4.8 to modern .NET 10. Cross-platform, cloud-ready, and under active Microsoft support.
.NET 4.x · WebForms · WCF · WinForms
Cloud-Native Transformations
Migrate to the cloud with microservices and event-driven architectures.
Azure · AWS · Kubernetes · Kafka
Hybrid Solutions
Combine on-premises and cloud for flexible, efficient deployments.
On-prem · VPN · Azure Arc · Hybrid
Virtualization Service
Run legacy MS-DOS applications on modern hardware, preserving functionality.
DOSBox-X · Containers · Win64 · Linux
.NET Core App Modernization
Modern runtime, outdated design: rebuild CRUD-over-tables .NET apps as a domain model that keeps history.
.NET 6–9 · Anemic entities · Read models · Event-sourced core
Why customers modernize
Nine outcomes, covered in full on the benefits page.
Preserve Business Logic
Modernize legacy infrastructure while preserving every business rule. Gain performance and security without losing decades of domain expertise.
New Insights
Modernization unlocks real-time visibility into business operations that legacy systems simply can’t provide. Business events that matter become data you can analyze, visualize, and act on.
AI & Machine Learning
Legacy systems lock data in formats modern ML tools can’t read. Modernization frees your data for LLMs, predictive models, and advanced analytics.
Stay Competitive
Legacy systems slow you down: every change is expensive, every integration is painful, and every new requirement takes months. Modernization restores the ability to move fast.
Boost Performance
Experience faster processing speeds and improved efficiency with updated technology. Modern runtimes, async I/O, and cloud scale deliver performance gains that legacy platforms can’t match.
Reduce Costs
Reduce operational expenses with streamlined, modern solutions. Less hardware, less licensing, less developer time fighting an aging stack.
Scalability
Adapt to growing business demands with scalable and flexible systems. Modern cloud-native architectures grow with you: no forklift upgrades, no emergency rewrites.
Improved User Experience
Enhance usability and accessibility for both employees and customers. Modern UIs are fast, responsive, accessible, and built for the devices people actually use today.
Future-Ready Solutions
Prepare your business for future technological advancements and challenges. A modern platform isn’t just caught up to today. It’s ready for what comes next.
A deliberate, four-phase process
Modernization fails when teams underestimate domain complexity. We don't. The discovery phase alone can surface business rules that have run unchanged since the Reagan administration, and those rules are often the point of the whole system.
Phase 01 · Discover
We audit your legacy system: source code, compiled dependencies, business rules, and institutional knowledge. Many of these systems carry 30+ years of undocumented domain logic. Discovery starts with the free consultation and, when the system warrants it, continues as a fixed-scope Legacy Software Assessment.
OUTPUT: System inventory · risk map · findings with evidence · recommendation
Phase 02 · Plan
We design a modernization path that balances cost, risk, and timeline. Sometimes the right answer is a full re-architecture. Sometimes it is virtualization. We recommend what fits. If you took the assessment, its fee is creditable toward the project.
OUTPUT: Target architecture · phasing plan · fixed-price proposal
Phase 03 · Modernize
We translate or rebuild. The target language depends on the skills your team can support in-house: C# .NET, Go, Rust, modern Delphi, or another platform you already run. We pick it with you so the result stays maintainable after handoff. AI accelerates the work where source is available; expert developers handle the domain and integration work AI cannot.
OUTPUT: Modern codebase · test suite · CI/CD pipeline
Phase 04 · Operate
We hand off production-ready systems with documentation, runbooks, and, if you want, ongoing managed services. Your business logic is preserved, your infrastructure is current.
OUTPUT: Deployed system · runbooks · optional MSA
Event Storming: how we map your domain
Before any code is written, we run Event Storming workshops with your subject-matter experts to surface the business rules and process flow that live inside your existing system. Read why it works, how we run it, and what you get.
14 verticals. One discipline.
The technology changes; the discipline does not. Career experience spans every sector where software older than the people maintaining it still runs the business.
Defense & Aerospace · Government & Public Sector · Healthcare & Life Sciences · Financial Services · Manufacturing · Energy & Utilities · Logistics & Supply Chain · Retail & Distribution · Insurance · Legal & Professional Services · Education · Construction & Real Estate · Agriculture · Industrial Automation & Process Control. Industry not listed? We adapt. 100% U.S. citizen workforce, U.S.-soil delivery, and every engineer onshore.
Decision guides & resources
Before choosing a vendor, work out whether you should move at all and how to sequence it: when not to modernize, rewrite vs strangler fig, and automated VB6 conversion vs manual rewrite.
When not to modernize
Five signals a legacy system should be left alone, what to do instead of a rewrite, and the conditions that genuinely justify modernization.
Rewrite vs strangler fig
Big-bang rewrite or incremental strangler fig? How each one fails, what the facade actually costs, and how we choose the sequence using Event Storming.
Automated VB6 conversion vs manual rewrite
What VB6-to-.NET converters do well, where they stop, and why the refactoring budget is the second half of the project rather than optional polish.
Event Storming template
The full Event Storming sticky notation with colours, the wall layout, and Miro setup steps. Free, no email required.
BDE replacement for Delphi applications
FireDAC, dbExpress, ADO or UniDAC in place of the Borland Database Engine, how Paradox and dBASE data moves to a SQL server, and the order to do it in.
Delphi 7 to 64-bit
Delphi 7 cannot build 64-bit. What breaks on the way to Win64 (Unicode, pointer sizes, inline assembler, components, the BDE) and the sequence that works.
VB6 applications on Windows 11
The VB6 runtime ships in Windows 11, so why do VB6 apps break there? OCX registration, 32-bit limits, DPI, Jet, installers, and a fix for each.
Who still supports VB6 in 2026
Microsoft supports the VB6 runtime, not the IDE. Who can still maintain a VB6 application, what real support includes, and when to migrate instead.
About Legacy to Modern LLC
Founded in 2025 in Reno, Nevada by Thomas Jaeger, who brings 40+ years of hands-on software experience across 14 vertical markets. 100% U.S. citizen workforce, U.S.-soil delivery, no offshore outsourcing.
He has also completed a 452-page practitioner guide to Event Sourcing and CQRS, built on a .NET reference implementation that is public under the MIT licence.
Frequently asked questions
What is legacy modernization?
Legacy modernization is the process of transforming outdated applications, typically written in MS-DOS languages, Visual Basic 6, Delphi, or older .NET Framework versions, into modern, supported, secure, and scalable software. We preserve your business logic while placing it on a current technology stack.
What platforms do you support for modernization?
Target platforms: Mac OS X, Linux, Windows (64-bit), and mobile (iOS, Android). Legacy source environments include MS-DOS, 16-bit Windows, and 32-bit Windows. We can create a modern version of your application that runs on 64-bit Windows, Linux, or macOS, or entirely on mobile when there are no hardware or peripheral dependencies.
How long does the modernization process take?
Duration varies with project scope and complexity, typically ranging from a few weeks to several months. Virtualizations are fastest since no application changes are required. Re-architecting a legacy application takes the longest, since business domain, processes, rules, and many other concerns must be considered. We scope concretely after discovery.
What are the costs associated with modernization?
Costs are determined by scope and requirements. Book a free 1-hour consultation and we'll provide a detailed estimate tailored to your system and objectives.
Why should I modernize MS-DOS applications?
MS-DOS applications have run reliably for decades, but operating them on aging hardware is increasingly difficult, since replacement parts are rare or unavailable. Modernization lets you use current technologies, improve user experience, and ensure compatibility with modern hardware and operating systems. We offer a range of approaches, from virtualization on modern hardware to full re-architecture focused on core business domains and processes.
How we modernize MS-DOS applications →
Why should I modernize Visual Basic applications?
VB for MS-DOS shares the same challenges as QuickBasic, Turbo Pascal, C, and assembly for DOS. VB for Windows applications typically depend on third-party controls that are no longer supported. Because these environments (Windows 3.x, 95, XP, and similar) are end-of-life, they pose security and reliability risks. Modernization lets you use current technologies, improve UX, and ensure compatibility with modern systems.
Why should I modernize Delphi applications?
Delphi is still viable today, but experienced developers are increasingly hard to find. Delphi itself has capabilities equal to or exceeding modern languages like Go, Rust, and C#. Because of those unique strengths, we offer several paths: in-place version upgrades (Delphi 1 to latest), or complete conversions to C# (or another modern language) with an option for new software architectures.
Why should I modernize existing .NET applications?
.NET Framework (1.x through 4.8) is in long-term support but no longer receives new features, runs only on Windows, and locks you out of the cross-platform .NET ecosystem. We modernize both Visual Basic .NET and C# applications, including WinForms, WPF, Web Forms, WCF, and classic ASP.NET projects, to current .NET (Core / .NET 10) running on Windows, Linux, or macOS.
Can you modernize mainframe systems?
We don't directly modernize mainframe systems, but we can re-architect an entire solution representing the business domain and processes of a typical mainframe system. The new solution runs on-premise, in the cloud, or hybrid, and replaces the legacy mainframe. These are long-term engagements, often months to years depending on domain complexity and access to subject-matter experts. Contact us to start the conversation.
What other types of applications should be modernized?
40+ years of experience, from 16-bit MS-DOS to cloud-native solutions in AWS and Azure. Modernizing any legacy system lets you gain real-time business insights through modern architectures (event-based, ML-integrated), so you can react quickly to market changes or create new revenue streams.
How do I get started with legacy modernization?
Book a free 1-hour consultation. We'll discuss your specific requirements and explore how we can help modernize your legacy systems. No obligation, no sales pressure. If the system warrants a deeper look, the next step is a fixed-scope Legacy Software Assessment, quoted after the call.
Why should we engage with Legacy to Modern?
40+ years of experience across 14 vertical markets. We started before the Internet existed, and we stay hyper-focused on the people who use the software and the business objectives it serves. 100% US citizen workforce on U.S. soil, no offshore outsourcing. And younger developers generally don't want to learn "dead" languages like QuickBasic, Turbo Pascal, or VB for Windows, making the expertise to understand these ecosystems rare and valuable.
Do you support other programming languages?
We currently support QuickBasic, BASIC PDS, Turbo Pascal, C, and Visual Basic for DOS under MS-DOS, plus Visual Basic for Windows and Delphi for Windows. Depending on your legacy system, we can add support for additional languages like FORTRAN77, evaluated case-by-case against in-house expertise. In all cases, understanding the business domain, processes, and documentation is critical for systems that need to be re-designed.
Why not just use AI to convert legacy apps?
AI helps where source code is available, but legacy systems frequently depend on compiled third-party components that cannot be converted, undocumented business rules, and domain knowledge AI has never seen. VB6 and Delphi apps often have this issue, and AI has seen very little MS-DOS code. We use AI where it accelerates the work, but it cannot replace the full modernization process. In the end, it's about the people who use these applications.
Is my project too small for you?
There are no small projects for us. Your application may just need virtualization, or a thin wrapper that offers a new interface while preserving the original functionality. Contact us either way. We're happy to help you figure out the right path.
How long does a modernization project take?
Virtualization projects take 2–6 weeks. Re-architecture projects range from 6 weeks for a small VB6 app to 9+ months for large enterprise systems. We scope every engagement with a fixed timeline after the free 1-hour consultation.
Are your developers US-based?
Yes. 100% of our workforce consists of US citizens working on American soil, with no offshore outsourcing.
What languages do you migrate from?
QuickBasic, Turbo Pascal, C, assembly, BASIC PDS, VB-DOS, Visual Basic 1–6, VBA, VB.NET, Delphi 1–12, and .NET Framework 2.0–4.8.
What do you migrate to?
Primarily C# .NET (Core / .NET 10), Go, Rust, and modern Delphi. We target Windows, macOS, Linux, iOS, Android, and AWS / Azure cloud platforms.
Do you offer free consultations?
Yes. Every engagement starts with a free 1-hour legacy system consultation. You receive a written preliminary recommendation with no obligation. If you want a deeper look first, the next step is a fixed-scope assessment.
Do you offer a paid assessment before committing to a project?
Yes. After the free 1-hour consultation, the next step is a fixed-scope Legacy Software Assessment: a read-only review of your application's source, database, configuration, logs, and architecture, ending in findings with evidence and a written recommendation. The fee is quoted after the consultation and is creditable toward a subsequent modernization project.
Which Delphi versions can you modernize?
All of them: Delphi 1–7, 2005–2010, XE–XE8, and RAD Studio 10.x through 12, VCL or FireMonkey, on BDE, dbExpress, or FireDAC. The paths are upgrade in place to Delphi 13, bridge behind a service boundary, or migrate to C# .NET, Go, or Rust.
Do you modernize plant-floor software such as HMI and SCADA front-ends or MES applications?
Yes, when it is custom application software in VB6, Delphi, C++, or .NET Framework. We modernize the application and its data layer, work inside production uptime windows, and do not replace PLCs or vendor SCADA platforms.
Contact Legacy to Modern
5150 Mae Anne Ave, Ste 405 #5581, Reno, NV 89523 · +1-775-773-3027 · business@legacytomodern.com