The Document Foundation says Microsoft's file formats keep users on a short leash

The Document Foundation (TDF) has criticized proprietary file formats and the lock-in they create, with Microsoft's ubiquitous Office formats drawing particular scrutiny. TDF would doubtless welcome a world where everyone used LibreOffice or another open equivalent, yet the reality is that Microsoft's productivity tools still dominate the office software market. However that shouldn't be a problem. Files are interchangeable these days, right? Office uses the Office Open XML (OOXML) format, so sw