A Sitecore to AEM migration is more than moving website pages from one content management system to another. For an enterprise, it can involve content restructuring, component redevelopment, asset migration, SEO preservation, integrations, personalization, analytics, workflows, user permissions, and a completely different content architecture.

Organizations often consider moving from Sitecore to Adobe Experience Manager (AEM) to consolidate their digital experience technology, modernize content operations, improve integration with Adobe Experience Cloud, or move toward a cloud-based architecture.

However, migration should not be treated as a simple lift-and-shift project.

Adobe's own migration guidance recommends an assessment, planning, proof of migration, testing, and controlled execution approach. Adobe also notes that migration planning should use real extraction and ingestion measurements rather than relying on generic estimates.

So how long does a Sitecore to AEM migration take? How much does it cost? And what problems should enterprises expect?

Let's break it down.

What Is Sitecore to AEM Migration?

Sitecore to AEM migration is the process of moving an organization's digital experience platform from Sitecore to Adobe Experience Manager.

The migration can involve several layers:

• Website pages
• Content models
• Components
• Digital assets
• Metadata
• URLs
• Redirects
• User accounts and permissions
• Workflows
• Forms
• Search
• Personalization
• Analytics
• Third-party integrations
• APIs
• Translation workflows
• SEO configuration
• Structured data
• Authoring processes

The important distinction is that Sitecore and AEM have different architectures and content-management approaches.

That means organizations should generally replatform and redesign where necessary instead of blindly copying the existing implementation.

Adobe's migration guidance emphasizes assessment and planning before execution, while Adobe's migration blueprint for legacy systems describes migration as a multi-stage process involving planning, implementation planning, AEM implementation, migration scripting, and migration execution.

Why Are Enterprises Moving From Sitecore to AEM?

There is no single reason for every migration.

Common drivers include:

1. Adobe ecosystem integration

Companies already using Adobe Analytics, Adobe Target, Adobe Real-Time CDP, Adobe Journey Optimizer, or other Experience Cloud products may want their CMS strategy aligned with the Adobe ecosystem.

2. Cloud modernization

Organizations may want to move away from heavily customized legacy infrastructure and adopt AEM as a Cloud Service.

3. Content operations

AEM provides enterprise content management and digital asset capabilities that can support large organizations managing multiple brands, regions, and digital properties.

4. Global website management

Enterprises operating dozens or hundreds of websites may want a standardized platform and reusable component architecture.

5. Digital experience transformation

A migration can also provide an opportunity to redesign the content architecture rather than carrying years of accumulated technical debt into the new platform.

This last point is important.

A migration is often the best time to remove things you no longer need.

Sitecore Replatforming vs Simple Content Migration

One of the biggest mistakes enterprises make is assuming that migration means:

Sitecore page → AEM page

In reality, the process is closer to:

Sitecore architecture → new AEM architecture → transformed content → validated experience

For example, a Sitecore implementation might contain:

• Custom templates
• Sitecore-specific fields
• Rendering parameters
• Custom pipelines
• Personalization rules
• Custom modules
• Legacy APIs
• Custom search functionality

These cannot always be transferred directly into AEM.

Therefore, Sitecore replatforming should begin with an inventory of what exists and a decision about what should actually be rebuilt.

Sitecore to AEM Migration Timeline

There is no universal AEM migration timeline.

A small corporate website with a few hundred pages can be dramatically different from a global enterprise with millions of content items and thousands of assets.

A reasonable high-level planning model is:

For a relatively straightforward enterprise implementation, the overall program could take 4–8 months.

Complex global implementations can easily take 9–18 months or longer.

These are planning ranges, not guaranteed delivery times.

Adobe recommends conducting proof migrations and using actual extraction and ingestion measurements to develop realistic migration estimates.

What Determines the Migration Timeline?

Several factors can significantly change the schedule.

Content volume

Migrating 10,000 pages is fundamentally different from migrating several million content items and assets.

Number of websites

A single website is easier to manage than a multi-brand, multilingual ecosystem.

Custom Sitecore development

The more custom functionality exists in Sitecore, the more analysis and redevelopment will be required.

Integrations

CRM, ERP, PIM, DAM, search, marketing automation, identity management, analytics, payment systems, and other integrations can add significant development time.

Content quality

Poorly structured or duplicated content can create additional cleanup work.

Localization

Multilingual websites require additional planning for language relationships, translation workflows, URLs, metadata, and localized assets.

SEO requirements

Preserving rankings requires careful handling of URLs, redirects, canonicals, metadata, structured data, internal links, XML sitemaps, and crawl behavior.

AEM Migration Cost: What Should Enterprises Budget?

The AEM migration cost varies significantly between projects.

There is no reliable single price for Sitecore-to-AEM migration because the project combines software architecture, development, content transformation, infrastructure, testing, project management, and potentially licensing.

A useful way to think about the budget is by project complexity.

These figures are indicative implementation-planning ranges, not Adobe pricing or fixed market quotes. Actual costs can be substantially lower or higher depending on the project.

The budget should also separate one-time migration costs from ongoing platform and operational costs.

What Contributes to AEM Migration Cost?

1. Discovery and architecture

Teams need to analyze the existing Sitecore environment and design the future AEM architecture.

2. AEM implementation

This includes:

• Templates
• Components
• Content fragments
• Experience fragments
• Workflows
• Authoring configuration
• Front-end implementation
• Backend services

3. Migration tooling

Large migrations often require custom scripts, transformation logic, APIs, ETL processes, or other automation.

Adobe's own legacy migration blueprint emphasizes that there is no single out-of-the-box migration tool for every legacy system. Migration projects may require custom transformation and migration scripting.

4. Content cleanup

Organizations may discover thousands of outdated pages, duplicate assets, obsolete content, and inconsistent metadata.

Cleaning this information before migration can reduce future maintenance costs.

5. Integration redevelopment

Sitecore-specific integrations may need to be redesigned for AEM.

6. Testing

Budget for:

• Functional testing
• Content validation
• Integration testing
• Accessibility testing
• Performance testing
• Security testing
• SEO testing
• User acceptance testing

7. Training

Authors and administrators need to understand the new platform.

8. Post-launch support

The migration budget should include hypercare after launch.

Step-by-Step Sitecore to AEM Migration Process

Step 1: Audit the Sitecore Environment

Start with a complete inventory.

Document:

• Websites
• Pages
• Templates
• Components
• Assets
• Workflows
• Users
• Roles
• Integrations
• APIs
• Search
• Personalization
• Analytics
• Forms
• Redirects
• SEO configuration

The goal is to understand what exists before deciding what should move.

Step 2: Classify Content

Do not migrate everything automatically.

Create categories such as:

• Migrate
• Consolidate
• Rewrite
• Archive
• Delete

This can dramatically reduce the amount of unnecessary content entering the new platform.

Step 3: Design the AEM Information Architecture

Define:

• Content hierarchy
• Content models
• Templates
• Components
• Tags
• Metadata
• DAM structure
• Workflows
• Permissions
• Localization model

This is where a replatforming project becomes different from a simple export/import exercise.

Step 4: Map Sitecore Components to AEM Components

Create a component mapping matrix.

Not every Sitecore component should receive a one-to-one AEM equivalent.

Some should be redesigned.

Step 5: Build the Migration Pipeline

For large implementations, automation is normally preferable to manually copying content.

A migration pipeline may include:

1. Extract Sitecore content
2. Transform source data
3. Map fields
4. Convert rich text
5. Transform media references
6. Create AEM content
7. Validate migrated content
8. Report errors
9. Reprocess failed records

Adobe's migration guidance for legacy platforms emphasizes iterative migration, scripting, data transformation, validation, and repeatability.

Step 6: Migrate Digital Assets

Assets require their own migration strategy.

Consider:

• Images
• PDFs
• Videos
• Documents
• Metadata
• Renditions
• Tags
• Folder structures
• References
• Duplicate files

Asset migration should not be treated as an afterthought.

Step 7: Migrate and Validate URLs

SEO can be one of the biggest risks in a CMS migration.

Create a URL mapping document containing:

Also validate:

• Canonical URLs
• XML sitemaps
• Robots.txt
• Internal links
• Breadcrumbs
• Metadata
• Structured data
• Hreflang
• Redirect chains

Step 8: Integrate Third-Party Systems

Audit every integration before rebuilding it.

Typical integrations include:

• CRM
• ERP
• PIM
• DAM
• Search
• Marketing automation
• Analytics
• Customer data platforms
• Identity providers
• Translation platforms
• Forms
• Payment systems

Do not assume an existing Sitecore connector will work unchanged with AEM.

Step 9: Run Proof-of-Migration

Before migrating everything, migrate a representative sample.

The sample should include:

• Different page types
• Different components
• Assets
• Multilingual content
• Complex pages
• Different workflows
• Important integrations

Adobe recommends proof migrations as part of migration planning and recommends using the measured results to extrapolate the larger migration timeline.

Step 10: Perform User Acceptance Testing

Business users should validate:

• Content
• Authoring
• Navigation
• Search
• Forms
• Personalization
• Workflows
• Localization
• Analytics

Technical validation alone is not enough.

Step 11: Prepare the Cutover

The final migration should have a documented cutover plan.

Define:

• Content freeze
• Final migration window
• Delta migration
• DNS changes
• CDN configuration
• Redirect deployment
• Monitoring
• Rollback procedure
• Stakeholder communication

Step 12: Monitor After Launch

Monitor:

• Organic traffic
• Rankings
• 404 errors
• Redirects
• Crawl errors
• Conversion rates
• Page performance
• Server errors
• Analytics tracking
• Search functionality
• Authoring issues

The first few weeks after launch are especially important.

Common Sitecore to AEM Migration Pitfalls

1. Treating migration as lift-and-shift

This is perhaps the biggest mistake.

AEM is not simply a new interface for Sitecore content.

Better approach: redesign the content model and component architecture where appropriate.

2. Migrating bad content

Moving obsolete content into AEM creates technical and editorial debt.

Adobe recommends identifying unhealthy content and cleaning it before migration activities where applicable.

3. Underestimating custom components

A website may appear to contain 30 components but actually depend on hundreds of variations and custom behaviors.

Audit component usage before estimating redevelopment.

4. Ignoring integrations

The CMS may be connected to dozens of systems that are invisible to ordinary content editors.

Create an integration inventory early.

5. Underestimating SEO

A technically successful migration can still damage organic traffic if URLs and metadata are poorly handled.

SEO should be involved from the discovery phase, not during the final week.

6. Migrating everything manually

Manual migration may work for a small website, but it becomes expensive and error-prone at enterprise scale.

Automate repetitive transformations wherever practical.

7. Not running a proof migration

Without a proof migration, teams often discover transformation and content-quality issues too late.

Adobe specifically recommends proof-of-migration exercises and measurement of extraction and ingestion times.

8. Forgetting content freezes

Content changes during migration can create inconsistencies between Sitecore and AEM.

Define when authors stop creating or modifying content and establish a controlled process for final updates.

9. Ignoring rollback

Every enterprise migration needs a rollback strategy.

Do not make production cutover a one-way door.

10. Underestimating training

A technically successful AEM implementation can still fail operationally if authors do not understand the new content model and authoring workflows.

How to Reduce Sitecore to AEM Migration Risk

A safer enterprise strategy is:

Assess → Design → Prototype → Migrate → Validate → Optimize → Cut Over

Use measurable checkpoints at every stage.

Before development

• Audit Sitecore
• Inventory content
• Inventory integrations
• Identify technical debt
• Define business requirements
• Create the future AEM architecture

Before migration

• Build migration scripts
• Define field mappings
• Test component mappings
• Clean content
• Establish URL mapping
• Prepare SEO migration

Before production

• Complete proof migration
• Perform UAT
• Test performance
• Validate analytics
• Test redirects
• Run security testing
• Prepare rollback

After launch

• Monitor SEO
• Monitor errors
• Validate analytics
• Review author feedback
• Fix migration defects
• Optimize performance

Sitecore to AEM Migration Timeline Example

For a mid-sized enterprise, a possible roadmap could look like this:

Large global programs may require multiple migration waves rather than one large cutover.

A phased approach can reduce risk by allowing teams to migrate selected sites, regions, or business units independently.

Final Takeaway

A successful Sitecore to AEM migration is not primarily a content-copying exercise. It is a digital-platform transformation.

The most important planning questions are:

• What content should actually move?
• What should be redesigned?
• Which Sitecore components need new AEM implementations?
• Which integrations need redevelopment?
• How will SEO equity be protected?
• How will migration be automated?
• How will the business validate the new platform?
• What is the rollback strategy?

For budgeting, avoid relying on a generic AEM migration cost estimate. Build the business case from actual content volume, component complexity, integration requirements, development effort, migration tooling, testing, SEO work, and post-launch support.

For the AEM migration timeline, use proof migrations and measurable technical data wherever possible. Adobe's current guidance specifically recommends gathering migration data and extrapolating extraction and ingestion times rather than relying purely on assumptions.

Ultimately, the strongest migration strategy is not the one that moves the most Sitecore content the fastest. It is the one that leaves the enterprise with a cleaner content architecture, a maintainable AEM implementation, preserved SEO value, reliable integrations, and a platform that can support the next stage of digital growth.