Legacy SharePoint Modernization: Challenges, Benefits, and Best Practices

Many organizations have relied on SharePoint for years to manage documents, collaboration, intranets, workflows, and business information. Over time, however, older SharePoint environments can become difficult to manage.

Legacy sites may contain outdated content, classic pages, custom code, complex permissions, older workflows, and business processes that no longer reflect how teams work today.

This is where Legacy SharePoint Modernization becomes important.

Modernization is not simply about moving existing SharePoint content to a newer environment. It is about assessing what an organization has today, deciding what should be retained, redesigning what needs improvement, and creating a more manageable Microsoft 365 environment.

Microsoft's modernization guidance recommends approaching the process through assessment, strategy, execution, and ongoing support.

What Is Legacy SharePoint Modernization?

Legacy SharePoint Modernization is the process of transforming older SharePoint environments into modern, easier-to-manage platforms that better support current business requirements.

Depending on the environment, modernization may involve:

• Moving SharePoint Server content to SharePoint in Microsoft 365
• Converting classic SharePoint experiences to modern experiences
• Replacing outdated workflows and custom applications
• Restructuring sites, libraries, and navigation
• Reviewing and simplifying permissions
• Removing obsolete or duplicate content
• Improving search and content discoverability
• Integrating SharePoint with Microsoft 365 services
• Establishing stronger governance and lifecycle management

The goal is not to modernize everything automatically. Instead, organizations should determine which sites, applications, workflows, and content still provide business value.

Why Are Organizations Modernizing Legacy SharePoint?

Older SharePoint environments can continue to support business operations, but maintaining them indefinitely can create technical and operational challenges.

Better User Experience

Modern SharePoint provides a more consistent experience across Microsoft 365. Users can work with modern pages, libraries, Microsoft Teams, OneDrive, and other services without relying heavily on older interfaces.

A modern experience can also make information easier to find and access across devices.

Reduced Technical Complexity

Legacy environments often contain customizations that were developed years ago for specific business requirements. Some may no longer be necessary, while others may depend on technologies or development approaches that are difficult to maintain.

Modernization provides an opportunity to replace unnecessary customizations with supported capabilities and simpler solutions.

Improved Content Management

A long-running SharePoint environment can accumulate outdated documents, duplicate files, abandoned sites, and multiple versions of the same information.

Microsoft recommends auditing content before migration and moving content that is relevant, current, and aligned with the intended outcome.

This can improve both searchability and the overall user experience.

Stronger Governance

Modernization also creates an opportunity to review who has access to information, how sites are created, how content is retained, and who owns each business area.

This is particularly important when legacy environments contain large numbers of unique permissions. Microsoft recommends paying close attention to permission scopes and simplifying complex permission structures where possible.

Better Microsoft 365 Integration

A modern SharePoint environment can become part of a broader Microsoft 365 ecosystem involving Teams, OneDrive, Power Automate, Power Platform, Microsoft Search, and other services.

Instead of SharePoint operating as an isolated repository, modernization can help position it as part of a connected digital workplace.

Common Challenges in Legacy SharePoint Modernization

Modernization projects often involve more than technical migration.

1. Complex Customizations

Custom web parts, master pages, workflows, scripts, third-party solutions, and integrations can make modernization more complicated.

Not every customization has a direct modern equivalent. Some may need to be redesigned, rebuilt, or retired.

Organizations should create an inventory of custom components before deciding on a migration approach.

2. Outdated and Redundant Content

Years of content accumulation can make it difficult to determine what should actually move.

Migrating everything may preserve unnecessary complexity in the new environment.

A content assessment should identify information that is:

• Current and actively used
• Business critical
• Duplicated
• Outdated
• Subject to retention requirements
• Suitable for archival or deletion

This makes modernization more purposeful and reduces unnecessary migration effort.

3. Complicated Permissions

Legacy SharePoint environments can develop complicated permission structures over time.

Different departments may have created unique access rules for individual folders, documents, or sites. Moving these structures without review can carry unnecessary complexity into the modern environment.

Permissions should therefore be assessed alongside content and site architecture.

4. Legacy Workflows

Older SharePoint workflows can be particularly challenging because business processes may depend on them even when the underlying technology is outdated.

Microsoft recommends identifying workflows that need to be retained and considering Power Automate when planning the future state of Microsoft 365 workflows.

5. User Adoption

Even a technically successful modernization can struggle if employees do not understand what is changing.

Users may be accustomed to existing navigation, document locations, approval processes, and collaboration methods.

Communication, training, documentation, and user involvement should therefore be part of the modernization plan from the beginning.

Best Practices for Legacy SharePoint Modernization

Start With an Assessment

Before changing the environment, understand what exists.

Assess sites, content, permissions, customizations, workflows, integrations, usage patterns, and dependencies.

Microsoft's modernization approach begins with assessment to identify which sites are suitable for modernization and understand the scope of the project.

This creates a fact-based starting point instead of relying on assumptions.

Clean Up Before Migration

Avoid treating migration as an opportunity to move everything.

Review obsolete sites, duplicate documents, outdated versions, inactive content, and unnecessary structures before migration.

This can reduce the amount of content that needs to be processed while creating a cleaner destination environment.

Define the Target Architecture

Organizations should decide what the modern environment should look like before moving large volumes of content.

Consider:

• Site architecture
• Hub sites
• Microsoft 365 groups
• Teams integration
• Navigation
• Naming conventions
• Permissions
• Metadata
• Search
• Governance
• Content ownership

A clear target architecture helps prevent the modern environment from becoming another collection of disconnected sites.

Modernize in Waves

Large SharePoint environments are rarely best handled as one large migration event.

A phased approach allows organizations to group sites into manageable migration waves based on business priority, complexity, dependencies, or department.

Microsoft's guidance specifically recommends using assessment results to identify sites and structure modernization into waves.

This also makes it easier to identify issues early and apply lessons to later phases.

Test Before Going Live

Testing should cover more than whether files successfully migrated.

Organizations should validate:

• Document accessibility
• Permissions
• Links
• Metadata
• Search
• Workflows
• Integrations
• Page layouts
• Business processes
• User experience

Pilot migrations can help identify problems before a larger rollout.

Plan Change Management

Users should know what is changing, why it is changing, and how their daily work will be affected.

Provide clear communication, training, documentation, and support before and after migration. Microsoft also recommends involving users throughout the implementation process and planning launch communications.

Building a Future-Ready SharePoint Environment

The real value of Legacy SharePoint Modernization comes from what happens after migration.

A modern environment should have clear ownership, governance, lifecycle policies, and standards for creating new sites and managing content.

Organizations should also establish processes for reviewing unused sites, managing permissions, maintaining metadata, and retiring content that is no longer needed.

Automation can further improve the environment by reducing repetitive administrative work and connecting SharePoint with broader business processes.

Most importantly, modernization should be treated as an ongoing improvement initiative rather than a one-time technology project.

Final Thoughts

Legacy SharePoint environments often contain years of accumulated content, customizations, workflows, and permissions. Simply moving all of that information into a modern platform does not solve the underlying problems.

A successful modernization starts with understanding the existing environment, removing unnecessary complexity, defining a future-state architecture, testing carefully, and helping users adapt to the new experience.

Legacy SharePoint Modernization is not about moving everything forward. It is about deciding what deserves to move forward, what needs to change, and what should be left behind.