How to Find Companies Running Legacy Technology

How to Find Companies Running Legacy Technology

Every year, thousands of companies continue running technology that’s outdated, unsupported, or approaching end-of-life. These companies aren’t doing it because they love legacy software. They’re doing it because migration is expensive, risky, and disruptive. But the longer they wait, the more painful (and costly) the eventual transition becomes.

For sales teams selling modernization services, replacement platforms, migration tools, or security solutions, companies running legacy technology represent some of the most predictable and valuable prospects in B2B. The challenge isn’t whether these companies need your product. It’s finding them at scale.

This guide explains how to use technographic data to systematically identify companies still running legacy technology and convert them into pipeline.

Why Legacy Technology Creates Urgent Buying Needs

Companies running outdated technology face a growing list of problems that intensify over time:

• Security vulnerabilities: Unpatched, end-of-life software is the primary attack vector for breaches. Companies know this, and their security teams are constantly pushing for upgrades.
• Compliance risk: Regulations like GDPR, SOC 2, and PCI DSS require up-to-date security practices. Legacy software makes compliance audits painful and sometimes impossible.
• Performance degradation: Older technology simply can’t keep up with modern traffic patterns, user expectations, and data volumes.
• Talent challenges: Developers don’t want to work with outdated technology. Companies running legacy stacks struggle to hire and retain engineering talent.
• Integration limitations: Modern tools and APIs often don’t support legacy platforms, creating data silos and manual workarounds.
• Rising maintenance costs: As technology ages, the pool of people who can maintain it shrinks, and the cost of specialized support increases.

Each of these problems gets worse over time, which means the value proposition for modernization gets stronger every quarter. Companies running legacy technology aren’t a “maybe they’ll buy” prospect. They’re a “they will buy eventually, and the question is when and from whom.”

What Counts as “Legacy Technology” in 2026

Legacy technology isn’t just mainframes and COBOL. In the fast-moving web technology landscape, software can become legacy within just a few years. Here are the major categories of legacy technology that sales teams should target:

Client-Side JavaScript Libraries

• jQuery (pre-3.x): While jQuery 3.x is still maintained, older versions (1.x, 2.x) have known security vulnerabilities and are no longer supported. Millions of websites still run jQuery 1.x.
• AngularJS (1.x): AngularJS reached end-of-life in January 2022. Google no longer provides security patches. Companies still running AngularJS face significant security and maintenance risks.
• Prototype.js and MooTools: These pre-jQuery libraries are effectively abandoned, but some enterprise applications still depend on them.
• Legacy Bootstrap (2.x, 3.x): While not a security risk, older Bootstrap versions indicate a website that hasn’t been modernized in years.

Content Management Systems

• Drupal 7: Reached end-of-life in January 2025. Companies still running Drupal 7 are on borrowed time, and the migration to Drupal 10+ is significant.
• WordPress (pre-6.x): Older WordPress versions with outdated PHP requirements are security risks, especially when combined with unmaintained plugins.
• Adobe ColdFusion: While still nominally supported, ColdFusion is increasingly difficult to maintain and find developers for.
• Custom CMS platforms: Companies that built their own CMS 10-15 years ago are often trapped with systems no one can maintain.

Server-Side Frameworks

• PHP 7.x and earlier: PHP 7.4 reached end-of-life in November 2022. PHP 5.x reached EOL years ago. Yet many websites still run on these versions.
• Rails 5.x and earlier: Ruby on Rails 5.x is no longer receiving security updates.
• Python 2.x: Python 2 reached end-of-life in January 2020, but legacy applications still depend on it.
• .NET Framework (pre-Core): Microsoft is pushing .NET 6+ and .NET Core. Companies on .NET Framework 4.x or earlier face eventual migration.

E-Commerce Platforms

• Magento 1: Reached end-of-life in June 2020. Companies still running Magento 1 face critical security vulnerabilities and PCI compliance issues.
• WooCommerce on outdated WordPress: The combination of old WooCommerce versions on old WordPress with old PHP is a triple legacy stack.
• Legacy on-premises e-commerce: Custom or proprietary e-commerce systems that predate modern platforms.

Infrastructure and Hosting

• Windows Server 2012/2012 R2: Extended support ended in October 2023.
• CentOS 7: Reached end-of-life in June 2024.
• Legacy shared hosting: Companies still on traditional shared hosting when their traffic and security requirements demand modern cloud infrastructure.

How to Find These Companies Using Technographic Data

The key to finding companies running legacy technology at scale is technographic search. Instead of manually checking websites one by one, you can query databases that track technology installations across millions of companies.

Step 1: Define Your Legacy Technology Targets

Start by listing the specific legacy technologies that signal a need for your product or service. Be specific. “Old technology” is too vague. You need exact technology names and versions.

For example, if you sell CMS migration services:

• Drupal 7
• Magento 1
• WordPress on PHP 5.x
• Joomla 3.x

If you sell JavaScript modernization services:

• AngularJS 1.x
• jQuery 1.x
• Backbone.js
• Prototype.js

Step 2: Search Technographic Databases

Use StackWho’s technology search to find companies currently running your target legacy technologies. Search for specific technology names and filter by company size, industry, and location to match your ideal customer profile.

This is where technographic data becomes a prospecting superpower. Instead of cold-calling random companies and hoping they have a modernization need, you can build lists of companies you know are running outdated technology.

Step 3: Prioritize by Risk Level

Not all legacy technology usage is equally urgent. Prioritize companies based on the risk level of their legacy stack:

Critical priority (immediate outreach):

• End-of-life software with known security vulnerabilities (Magento 1, AngularJS, PHP 5.x)
• E-commerce sites on unsupported platforms (PCI compliance risk)
• Companies in regulated industries running EOL software (healthcare, financial services)

High priority (outreach within 30 days):

• Software approaching end-of-life within 12 months
• Companies with multiple legacy technologies (compounding risk)
• Fast-growing companies whose legacy stack can’t scale

Medium priority (add to nurture):

• Older but still supported versions of software
• Legacy technologies with available migration paths
• Companies in industries with slower technology adoption cycles

Step 4: Enrich with Contextual Data

Once you’ve built your list of companies running legacy technology, enrich it with additional context that helps prioritize and personalize outreach:

• Company size and revenue: Larger companies have more budget for modernization but slower decision cycles. Smaller companies move faster but have tighter budgets.
• Industry: Regulated industries (financial services, healthcare, government) have compliance deadlines that force modernization.
• Recent funding: Funded companies have budget available for technology investment.
• Job postings: Companies hiring for modern technologies while still running legacy stacks are actively planning migrations.

Step 5: Craft Legacy-Specific Outreach

Generic sales outreach wastes the intelligence you’ve gathered. Your outreach should reference the specific legacy technology you’ve identified and the specific risks it creates.

Example outreach for a Drupal 7 migration service:

“I noticed your site is currently running on Drupal 7, which reached end-of-life in January 2025. With security patches no longer being released, your team is likely managing increasing risk with every passing month. We’ve migrated 40+ organizations from Drupal 7 to modern alternatives, and we’ve developed a process that minimizes downtime and preserves existing content and SEO equity. Would it be helpful to walk through what a migration timeline would look like for a site like yours?”

Example outreach for a JavaScript modernization firm:

“I came across your application and noticed it’s built on AngularJS, which Google stopped supporting in 2022. Beyond the security implications, most teams we talk to are finding it increasingly difficult to hire developers willing to work with AngularJS. We specialize in AngularJS-to-React migrations and have helped companies like [reference customer] transition without disrupting their users. Is your team thinking about this migration?”

Building Automated Legacy Detection Workflows

Manual legacy detection is fine for getting started, but to scale this approach, you need automation. Here’s how to build a repeatable workflow:

Weekly Technology Scanning

1. Define your target legacy technologies in StackWho
2. Run weekly searches for companies matching your legacy criteria
3. Compare results against your CRM to identify new prospects not already in your pipeline
4. Score new prospects based on risk level, company fit, and additional context
5. Route high-scoring prospects to sales with pre-built outreach templates

EOL Calendar Alignment

Maintain a calendar of upcoming end-of-life dates for major technologies. As each EOL date approaches, increase outreach intensity to companies running that technology. The 6-12 months before an EOL date is the highest-conversion window, because urgency is real but the deadline hasn’t passed yet.

Key upcoming EOL dates to plan around:

• Monitor vendor announcements for major framework, CMS, and language version deprecations
• Track PHP, Node.js, Python, and .NET version support timelines
• Watch for major CMS and e-commerce platform migration deadlines

Competitive Displacement Campaigns

Legacy technology detection is particularly powerful for competitive displacement. If your product replaces a specific legacy technology, you can build targeted campaigns:

1. Search for all companies running the legacy technology you replace
2. Filter for companies in your ICP (right size, industry, geography)
3. Build a multi-touch campaign that educates about the risks of the legacy technology and positions your product as the modern alternative
4. Time the campaign around EOL dates, security disclosures, or other triggering events

Industry-Specific Legacy Technology Patterns

Financial Services

Banks and insurance companies are notorious for legacy technology. Many still run COBOL on mainframes, but even their web-facing properties often use outdated CMS platforms and JavaScript libraries. Compliance pressure from regulators is often the trigger that forces modernization. Target financial services companies running EOL web technologies, and lead with compliance and security messaging.

Healthcare

Healthcare organizations face HIPAA compliance requirements that conflict with running end-of-life software. Many hospital systems and medical practices have websites running on outdated WordPress installations with plugins that haven’t been updated in years. HIPAA violations are expensive, which creates real urgency around modernization.

E-Commerce

E-commerce companies running legacy platforms face PCI compliance issues that can result in the inability to process credit card payments. Magento 1 stores, in particular, are operating in a high-risk environment. Lead with PCI compliance and the revenue impact of potential payment processing disruptions.

Education

Universities and school districts often have dozens of websites and applications running on legacy technology, managed by under-resourced IT departments. Accessibility compliance (ADA, Section 508) is an additional pressure point for educational institutions running outdated web technology.

Government

Government agencies at every level run legacy technology. Federal mandates around cybersecurity (like the Executive Order on Improving the Nation’s Cybersecurity) are creating top-down pressure to modernize. Government procurement cycles are long, so start conversations 12-18 months before you expect to close.

Measuring the Effectiveness of Legacy-Targeted Campaigns

Track these metrics to measure how well your legacy technology targeting is performing:

• Response rate: Legacy-targeted outreach should significantly outperform generic outreach. If you’re seeing 3-5x response rates, your targeting is working.
• Meeting conversion: What percentage of responses convert to discovery calls? Legacy prospects should convert at higher rates because the need is established.
• Pipeline value: Are legacy-targeted prospects generating larger deals? Modernization projects tend to be larger than incremental purchases.
• Sales cycle length: Legacy modernization can have longer or shorter sales cycles depending on urgency. Track this to calibrate your forecasting.
• Win rate: Compare win rates for legacy-targeted prospects against your overall win rate. Higher win rates validate the targeting strategy.

Common Pitfalls to Avoid

• Don’t lead with fear. While legacy technology creates real risk, leading with scare tactics can feel manipulative. Lead with the positive outcomes of modernization (better performance, easier hiring, reduced maintenance costs) and let the risk be supporting context.
• Don’t assume they don’t know. Most companies running legacy technology know it’s a problem. They’re not ignorant; they’re constrained by budget, resources, or organizational inertia. Approach with empathy, not condescension.
• Don’t ignore the decision timeline. Some companies plan modernization projects 12-24 months in advance. Getting into the conversation early is more important than getting a meeting this quarter.
• Don’t forget the total cost. Your prospect isn’t just evaluating your product’s cost. They’re evaluating the total cost of migration: downtime, retraining, data migration, opportunity cost. Address total cost of migration in your messaging.

Getting Started Today

You can start finding companies running legacy technology in the next 15 minutes:

1. Go to StackWho’s search page
2. Search for a specific legacy technology relevant to your product (e.g., AngularJS, Drupal 7, Magento 1, jQuery 1.x)
3. Filter results by company size, industry, or location to match your ICP
4. Build your first prospect list of companies running legacy technology
5. Draft personalized outreach that references the specific legacy technology and the specific risks or opportunities it creates

The companies are there. The need is real. And the data to find them is available today. The only question is whether you reach them before your competitors do.