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

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

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The core problems of the old system (bad wartability, outdated technology) remain.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

• Bitkom – German digital industry association.
• German Federal Office for Information Security (BSI).
• European Commission – Digital strategy.
• MDN Web Docs (Mozilla)
• W3C – World Wide Web Consortium.

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.