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Microsoft has published a set of documents that affirm our Interoperability Principles that increases openness, drive greater interoperability, and provide more choice for developers, customers, and competitors.
Highlights of the announcement include:
You can download the documentation from Open Specifications.
It is important to note that open source developers, whether commercial or non-commercial, will not need a patent license for the development of implementations of these protocols or for the non-commercial distribution of these implementations, according to Microsoft’s Patent Pledge for Open Source Developers.
This documentation on the Office binary file format is available to anyone on a royalty-free basis under Microsoft’s Open Specification Promise (OSP).
In addition, three projects were announced: