All the details on the Enterprise Mobility and Security Blog:
https://blogs.technet.microsoft.com/enterprisemobility/2017/04/12/azure-ad-b2b-collaboration-is-generally-available/
All the details on the Enterprise Mobility and Security Blog:
https://blogs.technet.microsoft.com/enterprisemobility/2017/04/12/azure-ad-b2b-collaboration-is-generally-available/