The true cost of changing office suites cannot be read on a price list. It is measured in training hours, in VBA macros to be rewritten, and in the passive resistance of business teams. Migrating to an alternative to Microsoft Office requires mapping these dependencies before comparing any subscription prices.
Macro and OOXML file compatibility: the real technical filter
Most comparisons stop at the ability to open a .docx or .xlsx file. The problem begins beyond that: templates with dynamic fields, workbooks filled with VBA macros, presentations with conditional animations.
LibreOffice interprets the OOXML format but does not guarantee the fidelity of VBA macros. Its Basic engine covers part of the language, but not all of it. As soon as a workbook calls COM objects or Windows APIs, the code no longer executes. For a small business whose accounting relies on custom-developed Excel macros, rewriting can represent several days of a developer’s work.
OnlyOffice adopts a different strategy: the native OOXML rendering is more faithful because the suite works directly in this format instead of converting it internally. Complex documents, including pivot tables, retain their layout better. However, OnlyOffice does not support VBA macros at all and instead offers JavaScript plugins, which necessitates a complete rewrite.
Google Docs circumvents the problem by importing files into its own cloud format. The conversion often alters advanced layouts and ignores macros. The tool is suitable for organizations that produce few structured documents, not for those that manage standardized business templates. To identify an alternative to Microsoft Office suitable for your context, the document compatibility criterion remains the first filter to apply.
Real migration cost: licenses, training, and lost time
Comparing the price of a Microsoft 365 subscription to the free LibreOffice makes no sense without factoring in hidden costs. We consistently observe three underestimated areas during migrations.
- User training: even a suite visually similar to Microsoft Office requires an adjustment period. Keyboard shortcuts change, menu logic differs, and some functions have different names. Count several half-days per user group to reach an equivalent productivity level.
- Conversion and verification of existing documents: a fleet of several hundred Word or Excel templates cannot be converted in bulk without control. Each critical file must be opened, reviewed, and corrected manually if necessary.
- Resistance to change: teams that have been using Office for years develop habits. The temporary loss of productivity is the most difficult cost to quantify, but it weighs heavily in the initial weeks.
An organization that switches solely to reduce its licensing expenses risks spending more on support than it saves on the subscription, at least in the first year.
Digital sovereignty and GDPR compliance: a structuring criterion
The choice of an office suite is no longer limited to functionality. Regulatory requirements push certain organizations, administrations, healthcare establishments, and communities to demand hosting in France or Europe, or even SecNumCloud qualification.
Suites like kSuite from Infomaniak (hosted in Switzerland) or self-hosted deployments of OnlyOffice meet these constraints. LibreOffice, installed locally, does not transfer any data to the cloud, which resolves the sovereignty issue by default, at the cost of lacking real-time collaboration.
The U.S. Cloud Act applies to data stored on Microsoft servers, including those located in Europe. For confidential documents or health data, this point is not trivial.
Perpetual license or subscription: a choice that commits
Office 2021 will reach end of support in October 2026. Organizations still on this version will have to choose between migrating to Office 2024 (perpetual license, without functional updates) or switching to Microsoft 365 (monthly subscription). This timeline creates a natural window to evaluate alternatives.
LibreOffice and OnlyOffice offer free versions without a subscription. Google Workspace operates on a subscription basis but at a generally lower price than Microsoft 365 for pure office functions.
Which office tool to choose according to usage profile
We recommend reasoning by dominant constraint rather than by a list of features.
| Main constraint | Recommended suite | Limit to anticipate |
|---|---|---|
| Minimal budget, individual use | LibreOffice | No native real-time collaboration |
| Intensive cloud collaboration | Google Workspace | Approximate OOXML rendering, no macros |
| Fidelity to Microsoft documents | OnlyOffice | No VBA support, more limited ecosystem |
| Data sovereignty | kSuite or self-hosted OnlyOffice | Limited third-party integrations |
| Critical VBA macros | Stay on Microsoft 365 | Recurring subscription cost |
No alternative suite replaces Microsoft Office with identical features. Each covers a different scope, and the right answer depends on what the organization is willing to give up or rewrite.
The choice rarely hinges on the displayed price. Before signing anything, open your ten most complex documents in the candidate suite. If the rendering holds and critical macros run (or can be rewritten within an acceptable timeframe), migration makes sense. Otherwise, the real cost far exceeds the licensing savings.