Mistakes in open-source migrations: 12 failures and countermeasures

Why open-source migrations fail

Organizations expect open-source to reduce costs, remove vendor lock-in and increase flexibility. But if support, training and working rules are not planned in advance, the result can be the opposite: downtime, unhappy users and rising hidden costs.

Failures rarely happen because of the software itself. More often what breaks is the surrounding process: who makes decisions, how changes are approved, who is responsible for access, how requirements are recorded and what to do if something goes wrong. Migration mistakes therefore look like "surprises", even though they were built into the process from the start.

Early warning signs appear long before rollout. For example, when a migration is done "on the side", without a project owner and without success criteria. Or when people think sending a manual is enough and habits will change by themselves.

Typical alarm markers include:

• no single inventory of applications, integrations and dependencies
• the pilot is postponed "for later" while a mass migration is planned immediately
• training and communications are not scheduled or budgeted
• no agreed rollback plan and responsible parties
• acceptance is reduced to "it seems to work"

It is important to distinguish a one-off problem from a systemic error. A one-off problem is a single bug or failure at a particular workstation that can be reproduced and fixed. A systemic error is recurring incidents across teams, an increase in workarounds (people reverting to old formats and processes) and ad hoc fixes.

If the project relies on the enthusiasm of a couple of people and lacks clear rules, this is not a "difficult period"—it's a signal to rebuild the plan and roles before mass migration begins.

How to embed countermeasures in the project plan: a step-by-step skeleton

The plan should answer not only "what we do" but also "what happens if something goes wrong". A good sign is that each step has success criteria, an owner and a clear verification.

A plan skeleton that supports the project

Start by agreeing on the goal and measurable criteria. "Save money" or "remove vendor lock-in" sounds fine, but won't help on launch day. Better to specify: how many workstations you will migrate, which applications must work, acceptable downtime, and which metrics you consider normal (login times, printing, document workflows, number of support requests).

Next, collect an inventory and constraints. You need real data: applications, plugins, printers, document templates, integrations, security requirements, regulations. Most projects fail because of an overlooked detail: Excel macros, a driver for a specific scanner, or a nonstandard print tray.

Then choose the target architecture and a pilot scope. The pilot should resemble "real life": different roles, different tasks, real load. For example, in a government body it makes sense to pick a small department that uses a digital signature, printing and typical documents, and run the pilot on representative PCs.

Countermeasures to include

It's convenient to include six blocks in the plan:

• goals and success criteria, plus "red lines" that stop the project
• inventory and a compatibility matrix: what works, what is questionable, what is unsupported
• pilot: schedule, test scenarios, feedback collection, decision process
• training and communications: short guides, timetable, "superusers" in departments
• rollout: in waves, with a rollback window and a clear return plan
• acceptance and post-launch: metrics, backlog of improvements, support mode

Fix problems found in the pilot, then expand coverage. After go-live, don't "close the project" the same day: schedule 2–4 weeks of intensified support and metric review so the new solution sticks.

Failures 1–2: training and change management

One of the most common open-source migration mistakes is assuming people "will figure it out themselves." As a result, staff keep working the old way: storing files in the wrong place, bypassing new rules, and only contacting support on the last day before launch.

Failure 1: training left until later

Training is often added after the technical work. But when users first see a new interface in production, they take the most familiar path, even if it's wrong. That leads to extra tickets, conflicts and unintentional sabotage.

Simple countermeasure: plan training together with the pilot and launch calendar, and train by role. Typically:

• users: 3–5 typical scenarios (documents, mail, collaboration) and short tips
• administrators: installation, updates, backups, monitoring, common incidents
• support: cheat sheets for frequent questions, response templates, escalation criteria
• managers: what changes in processes and how to measure the effect

In the first 1–2 weeks add "consultation hours" so people can get quick answers without long email threads.

Failure 2: no owner for changes and communications

If no one is responsible, the technical team does its part while users learn about changes by chance. Rumors, inconsistent rules and resistance follow: "we were not told anything."

Countermeasure: appoint a change owner (usually the project manager or a change manager) and agree a simple communications plan: what to announce, to whom, when and through which channels. A short rhythm works well in practice: announcement, one-week reminder, one-day instruction, launch-day support, feedback collection in 3–5 days.

Example: when a department moves to a new office suite, sending a one‑page memo, providing support request templates and appointing champions in each room noticeably reduces critical incidents on launch day. For complex infrastructure, decide in advance who will support users 24/7: in-house or an integrator.

Failures 3–4: inventory, requirements and compatibility

Failure 3: you migrate the "office" and critical items surface later

You migrate the "office" and then a critical Excel macro, an old accounting utility or an integration with a government portal remembered only by one person appears. Timelines slip, the team fights fires, and migration mistakes start to seem "unavoidable." The usual cause is gaps in the lists.

Countermeasure: a short but complete inventory with a criticality flag. Often a single table is enough: applications and versions (including small utilities), user groups and roles, integrations and data flows (mail, EDO, 1С, domain, printing), peripherals (printers, scanners, tokens, MFPs), and acceptable downtime windows.

Also document requirements to avoid arguing on "feelings": target schedules, peak load dates, downtime windows, security and retention requirements, and who signs off acceptance.

Failure 4: compatibility checked "in general" instead of on real cases

Later you discover that a driver for a specific printer is unavailable, document signing doesn't work, or files open but formats shift.

Countermeasure: a compatibility matrix and quick tests on typical tasks. For a procurement department these may be contract templates, printing to a specific tray, import into the accounting system, and working with a digital signature. A minimal test set usually includes printing and scanning on the most common models, key document formats, login and permissions (shared folders, mail access), tokens and critical portals, and a "day in the life" test for 3–5 typical users.

If hardware and peripherals are heterogeneous, choose reference workstations in advance and test them. For the rest, prepare a clear upgrade or replacement plan to avoid surprises in production.

Failures 5–6: integrations and legal nuances

Failure 5: the core moved but daily work stopped

People can't log in via SSO, documents don't print, emails don't send, and exchange with 1С or EDMS is intermittent. Problems are perceived as "open-source errors" when in fact dependencies were not documented.

Countermeasure: an integration map before the pilot with priorities: what must work on day one, what can be connected later, and what can be temporarily replaced by a process. For each integration record the goal, owner, connection method, tests and readiness criteria.

Often forgotten are mail and calendar (notifications, distributions, invites), EDO/EDMS, 1С, archive systems, SSO and printing (accounts, permissions, queues, drivers).

A separate risk is "orphan" connectors and APIs. Assign one owner per integration: who maintains the module, who accepts changes, who responds to incidents. If working with an integrator, include this in the project plan and support agreements.

Failure 6: licenses and rights remembered at the end

The team can assemble a working solution, then discover that a component cannot be used in a commercial product, another requires disclosing modifications, and a third cannot be distributed with the system image.

Countermeasure: a component registry and license check before procurement, development and publication. Minimum steps: maintain a registry (component, version, source, license, purpose), check license compatibility with each other and with your usage model, formalize rules for code and dependencies, define who approves new dependencies and updates, and prepare an attribution template if required.

Failures 7–8: data, formats and work habits

The middle of the project often breaks over data and people’s habits. These migration mistakes surface after launch when rollback becomes expensive.

Failure 7: data migration without clear rules

Duplicates, "lost" records, wrong fields and multiple versions of the same entity appear. Typical example: in CRM or HR systems some dates arrive in a different format, statuses don't match, and the same person is created twice due to different identifiers.

To avoid this, define migration rules and verify data quality before and after transfer. The migration plan should include field mapping, cleansing and deduplication (and an owner), quality control (samples, reconciliation, acceptable deviations), a change log and stop criteria.

A mandatory item before start is backups and restore verification. It's not enough to "make a backup": perform a test restore of a test environment and ensure data can be recovered quickly and completely.

Failure 8: document formats and collaboration break

Templates, macros, letterheads, complex spreadsheets, collaborative editing and print forms may behave differently.

A practical countermeasure: compile a catalog of critical templates (used daily and important for external recipients), run tests on real files and plan a transition period. During this period some documents remain in the old format while new ones use updated rules.

Failures 9–10: security, access and compliance

Many migration mistakes stem not from the software but from how access and controls are organized. If permissions are granted at the last minute, the team either gets excess privileges or starts bypassing restrictions because "otherwise it doesn't work."

Failure 9: access granted chaotically

Some employees lose access to needed folders and services, while others keep admin rights "just in case." That causes downtime and increases leak risks.

Countermeasure: discipline—define roles and groups first, then grant rights. Start with the principle of least privilege and record who does what in the system rather than "who is used to what." Two to four weeks after launch perform a short audit: who was granted too much, who was forgotten.

To avoid drowning in details, keep in the project plan: a roles-and-permissions matrix; a unified access request process and SLA for granting access; periodic reviews of groups and accounts (including terminated staff); baseline password, MFA and admin-account policies; and logging of key actions (logins, privilege grants, data exports).

Failure 10: compliance remembered after launch

Logging, retention periods, regulator requirements and internal policies are often considered when changing settings becomes costly. This is common in government, finance and healthcare where formal procedures and auditability matter.

Countermeasure: gather security and compliance requirements and agree them before the pilot. Internal policies, attestations, log and backup retention requirements should be part of acceptance criteria rather than "to be configured later."

Also plan incident response: who receives reports, who can isolate systems, where to look at logs, how to record actions and who authorizes recovery. Assign IT and security owners and run at least one dry run before launch.

Failures 11–12: testing, acceptance and rollback plan

Failure 11: "installed and it starts, so it works"

What breaks in migrations are not installations but business scenarios: printing, document templates, network folder access, signatures, specific macros, peak‑hour performance. If these are not pre‑checked, problems surface post‑launch when the cost of error is highest.

Countermeasure: test business processes, not just features. A good test plan includes role-based scenarios with expected results, load testing (morning peaks and pre‑report times), peripherals, failure situations (network outage, domain/mail unavailability, full disk) and recovery (backups, config rollback, data restoration).

Example: one department seemed fine until it turned out many staff printed to old MFPs with different drivers and queue formats. That’s not a global bug but a showstopper for those users.

Failure 12: no rollback plan and stop criteria

Without a plan the team keeps forcing the launch toward an outage: incident numbers rise, trust falls, and manual workarounds build up and are hard to remove later.

Countermeasure: agree in advance when to stop, who decides and how to return to the previous state. Minimum rollback plan elements: thresholds (response time, critical failures, number of incidents), maintenance window and communications, responsible parties (IT, security, process owners, contractors), rollback steps (data, accounts, policies, workstations), and support readiness (instructions, on‑call shifts, a hot week buffer).

Acceptance should be based on measurable metrics: not "users like it" but "support handles requests," "incidents do not exceed X per day," and "critical operations complete within Y minutes." That turns a migration from a lottery into a manageable project.

Practical traps remembered too late

Sometimes the worst migration mistake appears not in documents but in live operations when rollback is too late. These are usually organizational failures that are easy to foresee.

Trap 1: a key expert leaves and the project "goes blind"

One person may know integrations, rights, where the network hurts and why some users ignore procedures. If knowledge isn't recorded, every change becomes an investigation.

Include a minimal set of artifacts (and time to update them): a diagram of systems and integrations with owners and contacts, a list of critical roles and permissions with change approval process, a map of common incidents and fixes, one‑page user guides for the most frequent tasks, and a decisions log (what was changed, why and how to roll back).

Trap 2: pilot succeeds but scale hits network and storage

A pilot of 20 people may look great while 500 users overwhelm channels, storage and backup windows. This is common in organizations with branches and remote sites.

Run load tests in realistic conditions with real files, backup schedules and peak activity. If you are also upgrading hardware and adding server resources, agree in advance who changes configurations and who owns performance.

Trap 3: shadow IT and support overload in the first 2 weeks

If users don't know "how to do it now" they find workarounds: personal messengers, cloud services, USB drives. If support isn't ready, a flood of identical questions will swamp teams and frustrate everyone.

For the initial period adopt simple measures: strengthen first‑line support for 10–14 days with ready answers; create quick feedback channels and log recurring issues; agree rules (what is forbidden, what is allowed, what replaces it); and appoint champions in departments to help colleagues locally.

Short checklist: what to check before start and before launch

Migration mistakes are often remembered after incidents. To avoid firefighting, keep a short checklist in the project plan and revisit it at every status update.

Before start

First ensure the project has a goal and scope. Without that a migration quickly becomes endless rework.

• goals and metrics agreed with the business: what exactly will improve and how to measure it
• inventory complete: applications, plugins, macros, printers, drivers, network folders, user roles
• integration map documented and each system has an owner
• pilot contour ready: user group, test data, typical day scenarios, test plan with acceptance criteria
• training prepared: short guides, memos, support request templates, FAQ

A quick readiness test: ask 2–3 regular users to perform the five most common tasks (mail, documents, printing, access, collaboration) and record where they get stuck.

Before launch

At the finish line, risk control matters most. You can postpone a launch, but data loss and downtime are hard to recover.

• rollback plan approved and checked: who decides, how long recovery takes, which systems are restored first
• backups completed and a restore test performed (real restore test)
• security and access owners assigned: roles, permissions, logs, MFA, remote‑work rules
• licenses and legal issues closed: usage policies, source code/component requirements
• acceptance organized: criteria, signatories, which defects are acceptable and which block launch

If the migration affects workstations and servers (e.g., in government or banking), agree with security and operations on maintenance windows and the support format for the first 2–4 weeks after go‑live.

Example scenario: migrating a department to open-source without chaos

A 200‑person company decides to move office apps and some servers to open source. Goal: reduce vendor dependence and avoid common migration mistakes when people and processes are unprepared.

Run the pilot with 20–30 users, but not randomly. Select 3–5 people each from accounting, sales, HR, legal and support. Add 1–2 power users who like trying new things and 1–2 skeptics. The pilot should reflect real work, not "ideal conditions."

Choose 5–7 tasks most likely to break during transition: collaborative document editing with external partners; templates and printing (contracts, invoices, signatures, scanning); mail and calendar; spreadsheets with formulas and imports from 1С or ERP; file share access and permissions.

The transition period usually lasts 2–4 weeks: parallel work in old and new environments, a clear deadline for new documents, daily support windows and a quick question channel. For servers decide where the pilot runs (often on a separate node) to avoid risking production.

Measure success with numbers, not impressions. After 30 days:

• 70–80% of the pilot group complete key tasks without workarounds
• mean time to resolve common requests does not increase
• no data loss or critical outages

After 90 days evaluate more broadly: incident reduction, integration stability, readiness to scale to other departments and a clear support scheme (internal team plus contractor or integrator).

Next steps: how to start migration without burning out

The best protection is not heroics but a clear working rhythm. If you already see typical migration mistakes, turn them into a short plan with owners, deadlines and stop criteria.

Form a small working group: IT, security, a business representative and 1–2 power users. Record goals (what exactly changes), constraints (timelines, critical apps, regulator requirements) and success criteria (for example, the share of tasks done without workarounds).

Then act in short iterations:

• inventory: devices, OS, key apps, integrations, document types and templates
• pilot for 2–4 weeks: one department or role with manageable risks
• training: 30–60 minute mini-sessions and quick guides for frequent actions
• boost support for the first 10–14 days after launch: one channel and fast responses
• rollback plan and a recovery drill before the pilot

Example: accounting and procurement often rely on formats and macros, so start the pilot in a department with more web services and fewer heavy templates. In two weeks you will see where users lose time, which formats break and what to add to guides.

Agree in advance what blocks a launch, what is acceptable temporarily and who decides. And don’t try to do everything internally if infrastructure tasks are many—consider an integrator.

If you need help with servers, workstations and deployment, involving a systems integrator makes sense. GSE.kz (gse.kz), for example, manufactures PCs, workstations and servers in Kazakhstan and provides infrastructure support with 24/7 service across the country, which is especially useful during pilots and the first weeks after migration.