For one of our customers I am setting up CI builds that automatically publish NuGet packages to their private feed in VSTS Package Management (https://www.visualstudio.com/en-us/docs/package/overview). They are in the process of splitting up their monolithic Web Application into pieces and this is one of the steps we are taking.
To setup a VSTS (Visual Studio Team Services) account initially is very easy. The default user directory that is behind VSTS is a directory based on Microsoft Accounts (MSA). Quite some companies start by using MSA’s to access their VSTS instance and then decide to make the move to Azure Active Directory (AAD) once relevant data is already stored, but then face some issues.