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The Document Foundation says Microsoft’s file formats keep users on a short leash
The Document Foundation (TDF), which backs LibreOffice, has renewed its criticism of proprietary file formats, arguing that Microsoft's Office Open XML (OOXML) formats keep users locked into Microsoft's own software despite carrying ISO certification. TDF contends that although OOXML is technically a standard, only Microsoft Office fully and correctly implements it, meaning the format functions as proprietary in practice even though it holds an official standardisation stamp. The group frames this as a matter of digital sovereignty, warning that reliance on such formats leaves institutions and individuals dependent on a single vendor.
TDF points to the split between OOXML Transitional and OOXML Strict, noting that Strict removed most problematic legacy elements but Microsoft defaults users to Transitional, burying Strict further down the options list or dropping it from some versions entirely. It argues genuine document independence requires deliberate choices around formats, such as adopting the OpenDocument Format used natively by LibreOffice, and even fonts, to avoid dependency on software that could later lose support, citing the impending retirement of Microsoft Publisher as a cautionary example. TDF acknowledges the practical difficulty organisations face in moving away from proprietary tools given the sheer volume of existing documents, but insists that continued reliance perpetuates dependency rather than genuine interoperability.
In short
- TDF says Microsoft's OOXML format only works properly in Microsoft Office
- Microsoft defaults to messier OOXML Transitional, not cleaner OOXML Strict
- TDF urges open formats like ODF to avoid vendor lock-in and sovereignty risk
Steelman: both sides, in good faith
The strongest fair case each way — we don't pick a winner.
The case for
The Document Foundation's case rests on the distinction between technical openness and practical independence. While OOXML is ISO-certified, Microsoft remains the only vendor implementing it completely and correctly, whilst deliberately defaulting users to the Transitional variant laden with legacy elements rather than the cleaner Strict format. This creates functional lock-in despite formal standardisation—organisations cannot genuinely achieve document independence because they remain dependent on Microsoft's continued support and accuracy, particularly given the massive installed base of OOXML documents that only Microsoft Office handles reliably. True interoperability requires multi-vendor implementation parity, not merely published specifications, making the sovereignty concern genuine and justified.
The case against
Microsoft's defenders argue that OOXML is genuinely open and standardised, with public specifications and royalty-free implementation rights that allow legitimate competition and export to other formats. The market dominance of Microsoft Office reflects its superior features and usability rather than format manipulation—organisations remain free to adopt alternatives like LibreOffice, which successfully reads and writes OOXML. The Transitional format serves a genuine purpose in preserving legacy documents; mandating Strict by default would break compatibility and harm users. Conflating market success with vendor lock-in misunderstands the nature of switching costs—retraining and workflow disruption are inevitable for any established platform, not unique to proprietary restriction.
Explained simply
The Document Foundation is an organisation that supports LibreOffice, free software that competes with Microsoft Office. They are concerned about Microsoft's file formats, arguing that these formats keep users locked into Microsoft software despite being officially recognised as international standards.
Although Microsoft's Office formats have official international certification, the Document Foundation contends that in practice only Microsoft Office can use them properly. This matters because it means documents stored in these formats are effectively trapped within Microsoft software, forcing users to keep relying on Microsoft products even if they wish to switch away.
Many organisations and individuals continue using Microsoft Office partly because they have accumulated large volumes of documents in Microsoft formats over the years. The Document Foundation argues that organisations should deliberately adopt alternative formats like OpenDocument, which LibreOffice uses natively, to maintain genuine independence from any single company's decisions.