We are currently testing whether we can replace our current build server (TeamCity) with TFS 2015 Build.
Does anyone know of TFS 2015 has built-in Nuget Server like
VSTS and TFS now provide built-in support for Maven Package Management to compliment its support of NuGet and npm. https://blogs.msdn.microsoft.com/visualstudioalm/2017/05/22/visual-studio-team-services-demonstrates-how-microsoft-loves-java/
Package Management (NuGet with npm and maven coming soon) is currently only available for VSTS. The on-premises support for Package Management will come in the next version of TFS.
Source - TFS Feature Timeline for 2016