There was quite an upheaval when ODF development moved into OASIS from W3C and included quite a few patents, and OpenOffice at the time wanted to drop support for the new ODF features.
NATO calls for a recommended support for ODF, but a mandatory support Office Open XML
Office Open XML: Mandatory: Standard ECMA-376, Ed. 1: December 2006, Office Open XML File Formats.
Open Document Format:
Recommended: ISO/IEC 26300:2006, Information technology -- Open Document Format for Office Applications (OpenDocument) v1.0.
https://nhqc3s.hq.nato.int/Apps/Architecture/NISP/volume3/ap...
Same goes for many other examples especially from the governmental sector.
If MSFT wanted to bury ODF they might have managed to do so, since they've managed to get it under OASIS and tag a RAND clause into the ODF license they really don't care. EEE :)
So care to provide some references?
PS: I wasn't thinking of NATO, but of individual countries. ODF (and not OOXML) is mandatory in France, Netherlands, Norway, Portugal, Spain, Germany, Russia and it's becoming mandatory in Italy.
The real open format is ODF, which Microsoft is supporting somewhat but with warnings and only because they were forced to do it. That's still better than Google Docs though as GDocs can only import ODF. Which is quite ironic.