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Die 7 Strategien zur Legacy-Modernisierung: Welche passt... - Groenewold IT Solutions

The 7 strategies for legacy modernization: which one fits your company?

Legacymodernization • 14 January 2026

As of: 23 September 2026 · Reading time: 4 min

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Key takeaways

  • A detailed overview of the 7 Gartner strategies for legacy modernisation.
  • Find the right approach for your company, from Rehosting to Replacing.

A detailed overview of the 7 Gartner strategies for legacy modernisation. Find the right approach for your company, from Rehosting to Replacing.

“Digitalization is not an IT project—it is a business strategy.”

– Björn Groenewold, Managing Director, Groenewold IT Solutions

The 7 strategies for legacy moderation: Which fits...

In short

The seven strategies for legacy modernization — Retain, Retire, Rehost, Replatform, Refactor, Rearchitect. And Rebuild — offer different levels of effort and modernization depth.

The choice depends on system criticality, technical debt, and strategic business goals.


Opened at: 21. January 2026 ## 1. Introduction: The right way for your IT transformation

The decision to touch a legacy system that has grown over years has fallen. But how best to do it?

A one-sizefits-all approach does not exist when modernising old systems. The IT review house Gartner has defined seven basic strategies that companies can serve as orientation [1].

These range from minimally invasive interventions to complete new development.

Choosing the right strategy is crucial for the success of your modernization project. It not only affects the costs and time required.

However, also the degree of room to adapt, scalability and sustainability achieved.

In this article we will introduce you to the seven strategies in detail and give you a decision-making aid to find the best way for your company.

2. Migration options: The fast way to the cloud

A detailed overview of the 7 Gartner strategies for legacy modernisation.

Leaders exploring The 7 strategies for legacy moderation: Which fits... can use Legacy Modernisation, Cost Calculator: Legacy Modernisation, Solution: Legacy Reduction sowie Monolith vs. Microservices as structured entry points.

Migration options aim to convert existing applications into a new, more modern environment – usually the cloud – with as few changes as possible.

The focus is on fast successes and cost savings in operation.

Strategy 1: Encapsulate (capsules)

Short: In capsules, the legacy system is quasi packed into a "container&quot.

In capsules, the legacy system is quasi packed into a "container". And made accessible via modern interfaces (APIs). The core application itself remains intact.

This approach enables the features of the old system to be used quickly for new digital services or mobile applications without having to make profound changes.

  • Benefits: Low risk, fast rollout, low cost.

The core problems of the old system (bad wartability, outdated technology) remain.

Appropriate for: Companies that need to quickly create new digital offers and whose old system is still stable.

Strategy 2: Rehost (Lift & Shift)

Rehosting, also as "Lift & Shift" is the easiest way to the cloud.

The application is migrated 1:1 from its own on-premise infrastructure to an infrastructure as a service (IaaS) platform in the cloud.

No changes are made to the code itself.

  • Benefits: Very fast migration, immediate savings in hardware and operating costs.

  • Does not exploit the potentials of the cloud (e.g. scalability, PaaS services). The application is not "cloud-native".

  • Appropriate for: Companies who want to quickly withdraw from their own data center and whose applications do not require cloud-specific adjustments.

Strategy 3: Replatform

Short: This strategy goes one step further than pure rehosting.

This strategy goes one step further than pure rehosting. The application is also migrated into the cloud, but crumbled

References and further reading

The following separate references complement the topics in this article:

Frequently Asked Questions (FAQ)

What is this article about: “The 7 strategies for legacy moderation: Which fits...”?

Here we cover The 7 strategies for legacy moderation. This fits... — focused on architecture, process, and business outcomes.

In short: A detailed overview of the 7 Gartner strategies for legacy modernisation. Find the right approach for your company, from Rehosting to Replacing.

Who benefits most from the content described here?

Typical readers are business and IT leaders in Legacymodernization who want to secure quality, security, and ease of upkeep over the long term.

How does this topic fit into an IT or digital strategy?

In a digital strategy, prioritize stable core processes first, then extensions. See also professional software development and consulting.

For multi-system landscapes, IT consulting and architecture helps align vendors and internal teams.

What are sensible next steps if we need support?

If you need support with design, delivery, or modernization: schedule an appointment or outline your project via contact.

About the author

Björn Groenewold
Björn Groenewold(Dipl.-Inf.)

Managing Director of Groenewold IT Solutions GmbH and Hyperspace GmbH

Since 2009 Björn Groenewold has been developing software solutions for the mid-market. He is Managing Director of Groenewold IT Solutions GmbH (founded 2010) and Hyperspace GmbH. As founder of Groenewold IT Solutions he has successfully supported more than 250 projects – from legacy modernisation to AI integration.

Software ArchitectureAI IntegrationLegacy ModernisationProject Management

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Practical next steps after The 7 strategies for legacy modernization: which one fits your company?

The 7 strategies for legacy modernization: which one fits your company? addresses a practical choice for product and IT teams. Start with one clear goal: reduce legacy risk in controlled steps while daily work and key data remain available.

Check the current process, the data involved, and the result users need. Then record the main risks and define a small first step. This keeps the decision easy to review and gives your team a shared basis.

For implementation support, our legacy software modernization connects the article's guidance with architecture, delivery, and stable operations. Engineering and project ownership stay with our team in Leer, Germany.

This post belongs to Legacymodernization. Browse the related Legacymodernization articles or use the English software blog for other topics.

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Editorial evidence

For this prioritised expert article, we disclose the review scope and technical basis.

Review scope
Distinction between modernization strategies, risks and selection criteria.
Technical basis
Experience from analysing, stabilising and incrementally replacing established software systems.
Evidence in the article
Strategy comparison, decision criteria and risk notes in the article.
Technical review
Björn Groenewold, Managing Director of Groenewold IT Solutions GmbH and Hyperspace GmbH – reviewed on
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