Microsoft will be one of the first companies to adopt emerging open protocols for intelligence threat-sharing. The software giant in July announced its program for incident responders, such as CERTs, government entities, and private companies, that includes its own intel-sharing mechanism. The company says its platform will be based on the Structured Threat Information eXpression (STIX) open specification led by Mitre for expressing and specifying threat information, and the Trusted Automated eXchange of Indicator Information (TAXII)”]
Source: https://www.darkreading.com/attacks-breaches/microsoft-adopts-open-specs-for-threat-intel-sharing