Patching, testing, and propping up an aging ERP takes a real share of your budget. Moving that upkeep to the platform gives the time back to your team.
Last week went to a failed overnight job, a patch that had to be tested against six customizations, and a server warranty renewal. The project you planned for this quarter moved a little. It does most weeks.
Where the IT week actually goes
When the ERP is old and self-hosted, your team carries the whole stack. That means operating system and database patches, backup checks, hardware refreshes, security updates, and regression testing every time something changes. Most of it happens after the second shift goes home.
None of that work is wasted. It keeps the plant shipping. But it adds up. Deloitte's 2026 research estimates that technical debt accounts for 21% to 40% of an organization's IT spending. That's budget and people your team never gets to spend on the roadmap.
Why upkeep gets more expensive every year
Maintenance on an aging system rarely holds flat. Each deferred upgrade adds distance between your version and the current one. Each custom fix adds one more thing to test. The few people who know how it all fits together become a bottleneck.
IDC research reported by CIO.com ties technical debt to 49% to 60% higher maintenance costs at large enterprises. Mid-market plants feel the same pull, often with a smaller team absorbing it.
What changes when Microsoft runs the platform
SaaS ERP shifts responsibility for system maintenance and upgrades to the vendor. Here's what that looks like in Dynamics 365.
- Dynamics 365 Business Central online is hosted and operated by Microsoft, including infrastructure, patching, and backups. Updates arrive continuously, and your admins can set the update window so changes land when the plant can take them.
- Dynamics 365 Finance & Supply Chain Management runs as a Microsoft-managed cloud service with One Version continuous service updates. Its extension model keeps your changes separate from the core, so updates don't turn into rebuilds.
If customizations are what keep your upgrades stuck, our post on keeping custom code without the upgrade headache covers the extension model in more detail.
What IT still owns, and where the hours go next
Moving to the cloud doesn't make IT optional. Your team still owns security roles, integrations, data quality, testing extensions against updates, and supporting users. Those jobs matter more, not less.
What changes is where the freed time goes. Deloitte's 2025 Tech Value Survey found that nearly 60% of leaders believe another 21% to 50% of value is still trapped in their current tech, data, and people. For a manufacturer, that value usually sits in a few places:
- Connecting the ERP to MES, quality, and shop-floor data so the plant has one version of the truth
- Putting Copilot and the AI now built into Dynamics 365 to work on real planning and finance tasks
- Tightening identity and access controls across the plant
- Giving operations and finance the reports they keep asking for
The payoff shows up on the plant side too. Heathrow Scientific cut order processing time 20% and lifted output 15% without adding headcount after moving to Dynamics 365. Results like that start with a team that has time to work on them.
Start with a maintenance inventory
Before any platform decision, list the recurring work your team does to keep the current ERP running. Note the hours each task takes in a typical month. Then mark which tasks a Microsoft-managed service takes over, and which ones stay with you. That list gives you a real number to bring to the budget conversation, built from your own calendar. It also shows you which skills on your team are ready to move to new work, and which ones you'll want to build.
It also helps you right-size the platform. A single-site plant with a lean IT team often lands on Dynamics 365 Business Central. A multi-site operation with complex planning tends to fit Dynamics 365 Finance & Supply Chain Management.
Frequently asked questions
What does IT still own after moving to Dynamics 365?
No. Microsoft takes on hosting, patching, and platform upgrades. Your team still owns security, integrations, data, extension testing, and user support.
Do we lose control over when updates happen?
You keep a say in timing. Both products let administrators schedule updates within Microsoft's release cadence, so changes can land outside production hours.
Will continuous updates break our customizations?
Customizations built as extensions are designed to survive updates. They should still be tested against each update, which a good partner builds into routine support.
Put your team back on the roadmap
Over nearly 40 years and 1,750+ implementations, we've helped manufacturing IT teams move from keeping the old system alive to building what the plant needs next. For the full picture of what legacy ERP costs IT, download the Patch, Pray, Repeat whitepaper.
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