MCO (Operational Maintenance)
MCO ("Maintien en Condition Opérationnelle", operational maintenance) covers the actions needed to keep software functional, secure, and performant after it goes live. This includes security patches, bug fixes, performance monitoring, and dependency upgrades.
Operational maintenance becomes tangible within the first weeks of production: a JavaScript library releasing a security patch, a traffic spike slowing down a page, an outdated dependency blocking a future feature. On business software used daily by internal teams, skipping organized maintenance quickly shows up as accumulating slowness or unpatched vulnerabilities. Budgeting for it at the scoping stage, whether as hours or a monthly retainer, avoids unpleasant surprises a year after launch.
The common mistake is treating operational maintenance as optional once the software ships, when it should be budgeted and contracted from day one. Many companies only discover the gap when a security audit or a critical production bug reveals months, sometimes years, of dependencies that were never updated. Setting up a maintenance retainer at launch costs far less than a heavy technical rebuild down the line.
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