Mejix
    01 / 08Back to mejix.com

    Mejix · Legacy ERP Modernization

    Your Legacy ERP Doesn't Need to Be Replaced
    It Needs to Evolve

    Modernize SAP, Oracle, and Salesforce in 6 months — not 3 years.

    Zero downtime. Full data preservation. Phased and risk-mitigated.

    02 / 08 · The Legacy ERP Trap

    Stuck between two impossible choices.

    Most US enterprises run on ERP systems built for a 2004–2008 architecture. Both standard responses hurt — there's a third option.

    Choice 1 — Keep the legacy system

    Bleeding cash, losing talent.

    • End-of-life vendor support, premium pricing.
    • Can't hire engineers who want to work on 20-year-old tech.
    • Compliance and audit risk escalates each year.
    • Innovation blocked — the system is the constraint.

    Choice 2 — Rip-and-replace

    $3–5M, 18–36 months, real risk.

    • $3–5M+ investment plus 40% typical overrun.
    • 24–48 hour cutover window — revenue exposure.
    • 40% of replacements have data integrity issues.
    • User adoption drops 20–30% post-cutover.

    Choice 3 — Modernize strategically

    $400–600K, 6 months, zero downtime.

    • Keep operations running — phased, parallel migration.
    • Move 80% of data and business logic in 6 months.
    • Pilot first, measure, then scale at low marginal cost.
    • Easy rollback — your team owns the system.

    03 / 08 · The Real Cost of Inaction

    Doing nothing is the most expensive option.

    One realistic scenario — a US manufacturer running 12 plants on a fully customized SAP from 2008.

    Today

    Manufacturing · $150M revenue · SAP since 2008

    $1.3M

    Annual ERP run-rate

    Extended support + 3 FTEs + manual workarounds + audit overhead.

    Rip-and-replace

    Software + integration + change mgmt

    $3.5–5.5M

    Project cost (40% over-run typical)

    18–36 months timeline. 24–48 hr cutover risk.

    Mejix modernization

    Phased, integrated, zero downtime

    $430–570K

    Total investment

    6 months. ~$400K/yr ongoing savings. Easy rollback.

    5-year ROI

    ~$2M cumulative savings.

    Year-1 net

    $600K saved

    Payback in < 12 months. Then your team runs it.

    Years 2–5

    $400K / yr

    04 / 08 · Why Standard Approaches Fail

    Why rip-and-replace projects fail — and cloud migration alone doesn't help.

    40% of replacement projects run over budget or get cancelled. Here's why — and what to do instead.

    Full process redesign mid-flight

    Teams can't resist 'building it better' — extending the project 6–12 months and inflating scope beyond the original budget.

    Data migration complexity

    Legacy systems hold 10,000+ customizations and non-standard fields. 30–40% of data quality issues are discovered after cutover, not before.

    Business continuity risk

    A 24–48 hour cutover puts revenue on the line. An 8-hour outage at one mid-sized retailer cost $2M in lost orders.

    Change management failure

    Users trained for 10–20 years on the old system reject the new one. Productivity drops 20–30% and support costs spike for months.

    Lift-and-shift isn't modernization

    Moving SAP to AWS just makes legacy more expensive. Customization debt, compliance overhead, and slow performance all come along for the ride.

    The pattern

    40% over budget. 60% over timeline. Old problems on new infrastructure.

    Average overrun

    $800K–1.2M, 6–12 months.

    User adoption

    Drops 20–30% post-cutover.

    Real outcome

    No real modernization achieved.

    Legacy server racks transitioning into a modern cloud architecture

    05 / 08 · The Modernization Framework

    Phased, parallel,
    zero downtime.

    Three phases. Six months. Built around your operations, not against them.

    01Weeks 1–4

    Assess & pilot

    Audit the legacy system. Tag every module: keep, migrate, retire. Build the integration layer. Pilot one module (e.g. GL) in parallel — measure data integrity, performance, adoption.

    02Weeks 5–12

    Migrate core processes

    Move ~80% of business processes (GL, AR, AP, inventory, reporting) to the modern stack. Legacy keeps running in parallel. Real-time dual-write keeps data in sync.

    03Weeks 13–24+

    Retire legacy & optimize

    Migrate or sunset the remaining 20%. Legacy goes read-only for audit. Modern stack is primary. Team is trained, playbook documented, ownership transferred.

    Key principles

    Zero downtime — legacy runs in parallel, easy rollback at every step.
    Full data preservation — auditable history, no loss.
    Phased & risk-mitigated — measure success before you scale spend.
    Your team owns it — no vendor lock-in, playbook documented.

    06 / 08 · Real Proof

    Manufacturer · zero downtime · 6 months.

    SAP-2008 to a modern cloud ERP across 12 plants — without stopping a single production line.

    Industry
    Discrete manufacturing — valves, pumps, industrial equipment
    Size
    $150M revenue · 500+ employees · 12 plants
    Stack
    SAP 2008 (legacy) → NetSuite + integration layer + analytics
    Constraint
    24/7 production — no acceptable cutover window

    Project investment

    $4M+→$520K

    −87%

    Time to modern stack

    18–36 mo→6 mo

    −75%

    Production downtime

    24–48 hr→0 hr

    Zero

    Annual ERP run-rate

    $1.3M→$900K

    −$400K / yr

    Year 2+

    ~$2M saved

    SAP support sunset — no impact. Finance team can hire NetSuite talent. Cloud strategy unblocked. Legacy sits read-only for audit; the modern stack runs the business.

    07 / 08 · Sizing

    Size this to your operation.

    Same framework. Three pre-shaped engagements — flexed to module count and headcount.

    Small

    1–2 core modules

    <200 employees · 3–4 months

    Investment$250–350K
    Annual savings$150–200K / yr
    Payback18–24 months
    Most common

    Medium

    3–5 modules

    200–500 employees · 5–6 months

    Investment$400–600K
    Annual savings$300–500K / yr
    Payback< 12 months

    Large

    6+ modules · multi-site

    500+ employees · 6–9 months

    Investment$600–900K
    Annual savings$600K–1M / yr
    Payback< 12 months

    Quick calc

    Current ERP cost

    Software + labor + audit = X

    Annual savings

    ~40–50% of X post-migration

    Example

    $1.2M → $400K / yr saved

    08 / 08 · Common questions

    Quick answers.

    The questions IT, finance, and operations leaders ask before greenlighting an ERP modernization.

    Yes — for the typical 3–5 module mid-size engagement. We're not rewriting your business; we're moving 80% of processes to a modern stack while the legacy system runs in parallel. The 6-month figure is what we ship against, not a stretch promise. Larger or multi-site programs run 6–9 months across more pilots.