We have all had the experience of debugging an application in Visual Studio that contains external libraries. Usually, you don't have the debugging symbols or the original source code for those dependencies at hand. It's often difficult to obtain all of those, let alone to hook them up in your Visual Studio and step through the external sources.
A symbol server can provide relief there: symbol servers host the
.pdb files related to an assembly referenced in your project. Ever since Visual Studio 2005, a symbol server could be referenced in the Visual Studio settings to retrieve debugging symbols and source code for external assemblies directly from such symbol server.
Users of Microsoft Team Foundation Server (TFS) ...