SAP Migration · 6 min read · April 2026
Third-party maintenance for SAP ECC: a delay, not a way out of the data work
By Thinklytics Partners, SAP S/4HANA Practice
Up to half of ECC customers may intentionally miss 2027, moving to third-party maintenance to keep legacy systems running. It buys time. It does not retire the data debt.
Not everyone will move in time, and some will not move on purpose. Industry analysis suggests up to half of ECC customers may intentionally miss the 2027 deadline, shifting to third-party maintenance to keep their legacy systems patched and running. It is a legitimate decision under budget and resource pressure. It is also widely misunderstood as a way out, when it is really a way to buy time.
What third-party maintenance is
Instead of paying SAP for support and upgrading, you contract a third-party provider such as Rimini Street to keep your existing ECC system patched and secure past 2027. The system keeps running. You stop the upgrade clock without losing day-to-day support.
The SAP ECC support timeline
What each milestone actually changes for a running ECC estate.
| Milestone | Date | What it means |
|---|---|---|
| Older ECC releases end | 2025 | Pre-ECC 6 enhancement packs already off mainstream support. |
| ECC 6 mainstream maintenance ends | Dec 31, 2027 | Fixes, legal/tax updates, and standard support stop unless you pay for extension. |
| Extended maintenance ends | 2030 | The paid relief valve runs out. A narrow private-cloud option exists beyond it for some large accounts. |
Source: SAP maintenance roadmap, 2026.
Why companies choose to hold
The reasons are practical: the budget is not there this year, the team is stretched, or another priority is in front of the migration. For these companies, third-party support is a reasonable bridge that keeps operations stable while they decide on a path or fund the move.
What a data defect costs by the time you find it
The same duplicate, three points in the program. The cost multiplies as you move right.
| When you find it | What it becomes | Relative cost |
|---|---|---|
| During planning | A routine cleanup task | 1x |
| During conversion | A schedule risk and rework | 10x |
| After go-live | A business incident: finance cannot reconcile | 100x |
Source: Thinklytics SAP data readiness practice, 2026.
What it does not solve
Here is the catch. Third-party maintenance keeps the system alive, but it does nothing for the condition of your data. Duplicate customers and vendors keep multiplying. Dark data keeps growing. Master records stay ungoverned. The data debt that makes a migration hard does not pause when you defer the migration. It compounds, so the eventual move is harder and more expensive than it would have been.
The CIO's pre-commit checklist
Clear these before you lock a date, a budget, or a partner. Each one is cheaper to settle now than to discover mid-program.
- Readiness assessment complete. A measured baseline of data condition and custom code, not a vendor's optimistic estimate.
- Data quality baseline and cleansing plan. Duplicates, gaps, and obsolete records quantified, with an owner and a sequence.
- Custom code inventory and disposition. Every object marked retire, remediate, or move to BTP. The clean-core target set.
- Path decided on evidence. Brownfield, greenfield, or RISE chosen from the assessment, not from a slide.
- Partner and budget locked early. Senior capacity booked before the 2027 crush, with a contingency for the 30% that slips.
- Reporting continuity planned. How Tableau, Power BI, and BW reporting survive the cutover, decided up front.
Source: Thinklytics SAP S/4HANA practice, 2026.
The smart way to use the extra time
If you are going to hold, use the time. The cheapest moment to fix duplicates, dark data, and broken master data is before a migration, not in the middle of one. Cleaning and governing the data while you wait turns a deferral into preparation, and it pays back immediately in cleaner reporting and less operational friction. When you are finally ready to move, the hard part is already done. Don't move the mess. Clean it first.
Frequently asked questions
What is third-party maintenance for SAP?
It is support for your existing ECC system from a provider other than SAP, such as Rimini Street. They keep the legacy system patched and running past the 2027 mainstream maintenance end, without requiring you to upgrade to S/4HANA.
Why do companies choose to hold on ECC?
Budget limits, resource constraints, and competing priorities. Industry analysis suggests up to half of ECC customers may intentionally miss the 2027 deadline, using third-party support to keep running while they decide on or fund a migration.
Is staying on ECC a safe long-term plan?
It is a deferral, not a destination. Third-party support keeps the lights on, but the system stops getting SAP innovation, integrations age, and the eventual migration still has to happen. The decision buys time and trades it for accumulating risk.
What does third-party maintenance not solve?
It does nothing for the condition of your data. Duplicates, dark data, and ungoverned master records keep accumulating while you wait, which makes the eventual migration harder and more expensive than if you had cleaned as you went.
What is the smart way to use the extra time?
Clean the data while you hold. The cheapest time to fix duplicates, dark data, and broken master records is before a migration, not during one. Using the deferral to get the data ready turns waiting into preparation.
Can you help if we are not migrating yet?
Yes. The data foundation, quality, and governance work stands on its own and pays back even before a migration, in cleaner reporting and lower operational friction. It also makes the move far easier when you are ready.
Topics covered
- Third-Party Maintenance
- Rimini Street
- SAP ECC
- Migration Strategy
Frequently asked questions
What is third-party maintenance for SAP?
It is support for your existing ECC system from a provider other than SAP, such as Rimini Street. They keep the legacy system patched and running past the 2027 mainstream maintenance end, without requiring you to upgrade to S/4HANA.
Why do companies choose to hold on ECC?
Budget limits, resource constraints, and competing priorities. Industry analysis suggests up to half of ECC customers may intentionally miss the 2027 deadline, using third-party support to keep running while they decide on or fund a migration.
Is staying on ECC a safe long-term plan?
It is a deferral, not a destination. Third-party support keeps the lights on, but the system stops getting SAP innovation, integrations age, and the eventual migration still has to happen. The decision buys time and trades it for accumulating risk.
What does third-party maintenance not solve?
It does nothing for the condition of your data. Duplicates, dark data, and ungoverned master records keep accumulating while you wait, which makes the eventual migration harder and more expensive than if you had cleaned as you went.
What is the smart way to use the extra time?
Clean the data while you hold. The cheapest time to fix duplicates, dark data, and broken master records is before a migration, not during one. Using the deferral to get the data ready turns waiting into preparation.
Can you help if we are not migrating yet?
Yes. The data foundation, quality, and governance work stands on its own and pays back even before a migration, in cleaner reporting and lower operational friction. It also makes the move far easier when you are ready.