For large enterprises, expanded “cloud-to-cloud” cross support between Microsoft and Oracle cloud services was announced as follows

https://redmondmag.com/articles/2019/06/05/microsoft-oracle-cross-cloud.aspx

https://www.oracle.com/cloud/oci-azure.html

Microsoft and Oracle on Wednesday together announced an expansion of their partnership, with new “cross-cloud” capabilities for larger organizations to tap. Both companies, as providers of public cloud services to organizations, have been competitors, but they’ve nevertheless had a close partnership for the last six years around their hosted applications and services offerings. With this week’s announcement, the companies have now expanded their applications support, added Azure Active Directory identity and access management, and improved interconnectivity between their cloud solutions, while also providing customer support.