In this post, Premier Developer Consultant Marius Rochon shows us how to use Azure AD to enable partner access to Sharepoint 201x.
The following summarizes my experience with setting Azure AD as authentication provider for Sharepoint 2013 or 2016. This setup enables access to SharePoint for external users (business partners, customers). While there are other approaches that could be used for this purpose, e.g. an on-premises AD with ADFS, using Azure AD has a number of advantages: