Estimate Project
Sage · Dynamics SL · SAP Business ByDesign

Legacy ERP to Business Central migration.

Sage, Dynamics SL, and SAP Business ByDesign were built for a different decade. Move to Microsoft Dynamics 365 Business Central on a fixed scope, with your data, history, and customizations preserved and near-zero downtime. One connected, cloud-native system for finance and operations.

Get a Free Migration AssessmentEstimate Cost of Staying
Zero data lossCustomizations keptFixed scope, fixed price
Migrating legacy ERP teams since 2008
Microsoft Solutions Partner
Listed on Microsoft AppSource
4.8 on G2
15+ yearsMigrating ERP systems
Records on the move

Watch your data arrive in Business Central.

Every migration runs through the same controlled console. Master records, transactions, and customizations are read from Sage, Dynamics SL, and SAP Business ByDesign, mapped to Business Central objects, then reconciled to your live totals before a single user logs in.

  • Read once, validated twice, reconciled to the dollar
  • Customizations rebuilt as supported extensions, not bolted on
  • Parallel run until the numbers match, then one weekend cutover
Cost of staying on legacy ERP

Estimate the annual cost of staying on your legacy ERP.

Legacy ERP keeps billing you every year for servers, upkeep, manual reporting, and the connectors that hold it together. Pick your source system and move the sliders to size what staying really costs, and what Business Central gives back.

Tell us about your environment

80
2
12
10
What legacy ERP costs you, every year
$58,400a year, just to keep the old system running
Information technology upkeep and patching$20,800
Servers and infrastructure$15,000
Manual reporting$13,000
Connectors and extended support$9,600
Potential savings on Business Central
$48k to $66ka year you could recover
Three-year opportunity: $171k
Get Your Full Cost Breakdown
Will we lose our data?

No. Your data, history, and customizations come across cleanly.

It is the first question every team asks. The honest answer: nothing of value is thrown away. We map every record and every customization before we touch it, then split your environment into three buckets, what lifts cleanly, what we rebuild as modern Business Central extensions, and what we retire on purpose.

Comes across cleanlyRebuilt as a Business Central extensionRetired by design
Master and reference data

Customers, vendors, items, chart of accounts, and dimensions, lifted and reconciled to your live totals.

Comes across
Transactions and balances

Open and posted transactions, ledger entries, and historical balances, reconciled to the dollar before cutover.

Comes across
Customizations and reports

Custom fields, workflows, and report layouts rebuilt as supported Business Central extensions, with the business logic preserved.

Rebuilt as extensions
Dead weight and duplicates

Sandbox copies, duplicate records, and brittle one-off connectors stay in the archive by design, so you start clean.

Retired on purpose
Sage

Sage 50, Sage 100, Sage 300, and Sage X3. Chart of accounts, customers, vendors, and open balances map cleanly, and custom Sage reports are rebuilt natively on Business Central with Power BI.

Dynamics SL

Project accounting, allocations, and flexible keys carry into Business Central dimensions. Customizations and Crystal Reports are inventoried during discovery and rebuilt as supported extensions.

SAP Business ByDesign

Finance, procurement, and order data export cleanly from the cloud. Workflows and forms are re-mapped to Business Central, with bank feeds and analytics moving to built-in Microsoft connectors.

The migration process

A controlled move, week by week.

Roughly twelve weeks, fixed scope locked at the start. Here is what happens each phase, from discovery through go-live and hypercare. Stages overlap by design, so the team is never offline for more than a single planned window.

W1
W2
W3
W4
W5
W6
W7
W8
W9
W10
W11
W12
Discovery and assess
Inventory the source system, customizations, integrations, and data.
Weeks 1 to 2
Plan and fixed scope
Roadmap, downtime windows, and a locked, fixed-price scope.
Weeks 2 to 3
Rebuild on Business Central
Customizations re-coded as supported Business Central extensions.
Weeks 3 to 7
Data migration
Master and transactional data moved and reconciled to your live totals.
Weeks 5 to 9
Parallel-run validation
Old and new run side by side until the numbers match.
Weeks 8 to 10
Cutover and go-live
Phased switch to Business Central over one planned weekend.
Week 10
Hypercare and support
On-call hypercare, then ongoing managed support.
Weeks 10 to 12
Discovery and planRebuild and migrateGo-live and hypercare

Stages overlap by design. Parallel-run validation finishes before go-live in week 10, so the cutover weekend is the only planned downtime.

Migration readiness score

Are you actually ready to leave your legacy ERP?

Most legacy ERP migration delays come from undocumented customizations, dirty data, unknown integrations, and unclear ownership. Tick what you can confirm across the four areas below to score your readiness and see exactly where the gaps are.

Data readiness
0 of 4 confirmed
Technical readiness
0 of 4 confirmed
Team and process readiness
0 of 4 confirmed
Commercial readiness
0 of 4 confirmed
Your legacy ERP migration readiness score0 of 16
High migration risk

Tick what you can confirm today. A free migration assessment maps every gap before you commit.

0 to 4High migration risk5 to 8Discovery required9 to 12Good candidate13 to 16Ready for planning
Get a Free Migration Assessment
Why Redefine

Why teams choose Redefine to move.

Not a generalist that also does ERP. A Microsoft Dynamics migration team that has moved heavily customized legacy systems onto Business Central, on fixed scope, with the data and customizations intact.

  • Sage, Dynamics SL, and SAP Business ByDesign, all of it.One team that has migrated each of these source systems, including the older and heavily customized builds many partners will not touch.
  • Rebuilding customizations is the core skill.Your custom fields, workflows, and reports are rebuilt as supported Business Central extensions, not bolted on and not left behind.
  • Manufacturing and distribution focus.Costing, work orders, and multi-location inventory, the areas where generic migrators get stuck and projects stall.
  • Fixed scope, fixed price.A defined statement of work with milestone payments. No surprise project fees in week six.
  • We stay after go-live.Hypercare and ongoing managed support once you are live, so your team is not alone at the first month-end.
15+
Years migrating ERP systems onto Microsoft Dynamics
3
Source families covered: Sage, Dynamics SL, SAP Business ByDesign
8 to 16
Weeks for a typical mid-market migration, end to end
$0
Records left behind, reconciled to your live totals
Proof, not promises

Teams that already moved.

Real Microsoft Dynamics 365 engagements, and the numbers our clients reported after leaving their legacy ERP behind. Multi-channel commerce, business-to-business operations, and order processing at scale.

Platform migration to Dynamics 365
$70M+

Half Price Drapes

After unifying fragmented systems onto Dynamics 365 with integrated Power BI analytics, Half Price Drapes scaled annual revenue past seventy million dollars. Inventory, orders, and fulfillment moved into one place, with real-time dashboards replacing manual reporting across every sales channel.

  • Inventory, order, and customer data centralized into real-time dashboards
  • Customer experience and decision-making improved across all channels
Legacy ERP to Business Central
1 system

Lanrover

Lanrover replaced a legacy ERP with limited scalability by moving business-to-business finance, sales, and customer operations onto Dynamics 365 Business Central, on Azure with Microsoft Entra identity. Siloed processes were unified, compliance readiness improved, and the foundation now scales with the business.

Legacy ERP to Business Central
Multi-platform

WP Inova

WP Inova migrated off a constrained legacy ERP to Dynamics 365 Business Central and centralized orders from multiple platforms into one view. Customization limits were removed and order processing scaled cleanly.

Manual order handlingCentralized
BeforeSiloed
AfterOne view
Your next step

Get your legacy ERP migration assessment.

Twenty minutes with a Microsoft Dynamics partner who has migrated heavily customized Sage, Dynamics SL, and SAP Business ByDesign environments. You leave with six things, written down and yours to keep, whether or not you go ahead:

  • Your migration readiness score
  • A customization and add-on review
  • A data and integration mapping
  • A savings estimate for your environment
  • A fixed-scope migration roadmap
  • Business Central licensing guidance

Microsoft Solutions Partner. We reply within one business day.

Frequently asked questions

Questions teams ask first.

Grouped by what teams worry about most when leaving a legacy ERP: cost, data, customizations, timeline, and risk. Direct answers, no hedging.

Get a Free Migration AssessmentEstimate Cost of Staying
Systems and scope
Most often Sage (Sage 50, Sage 100, Sage 300, and Sage X3), Microsoft Dynamics SL, and SAP Business ByDesign. The approach is the same regardless of source: inventory the data and customizations, map every object, then rebuild on Business Central with the totals reconciled to your live system.
Cost
Most legacy ERP to Business Central migrations land between 40,000 and 175,000 dollars, driven by user count, the number of customizations, and the integrations that come across. You leave the assessment with a fixed-scope range, not an open-ended estimate. The calculator on this page sizes it against your own environment.
Data and customizations
No. Master data, open and posted transactions, and historical balances are migrated and reconciled to the dollar against your live system before cutover. Customers, vendors, items, chart of accounts, and dimensions all come across. Sandbox, test, and duplicate records stay in the archive by design.
Custom fields, reports, and workflows are rebuilt as supported Business Central extensions. The business logic is preserved and upgraded to the modern, cloud-ready extension model so it keeps working and stays upgrade-safe. Nothing is bolted on, and nothing is thrown away.
That is normal, and it is part of the project. Discovery surfaces duplicate accounts, inactive items, and unreconciled balances early, so cleanup happens before migration rather than after. The readiness scorecard on this page shows you where the gaps are before you commit.
Timeline and risk
Most projects run 8 to 16 weeks end to end. Discovery and planning take 2 to 4 weeks, rebuild and data migration take 4 to 10 weeks, and cutover plus hypercare close the engagement. You get the full milestone schedule in the assessment.
Near zero. A parallel-run validation phase runs before cutover, then go-live ships over a single planned weekend window, so your team is never offline during business hours.
Legacy ERP keeps billing you for on-prem servers, manual reporting, brittle integrations, and upkeep, while limiting cloud access, real-time analytics, and the ability to scale. Business Central removes those carrying costs and gives finance and operations one connected, supported, cloud-native system.
Yes. Bank feeds, Power BI, Outlook, Excel, e-commerce, and Power Automate are built into Business Central, so many connectors you paid to maintain on a legacy ERP simply drop off the bill. Anything bespoke is mapped during discovery and rebuilt or reconnected before go-live.

Get on a call with us to see how we can help you

Get a Quote