I have read a couple of posts for instance... http://blogs.msdn.com/b/adamroot/archive/2009/06/17/source-server-and-symbol-server-features-in-team-foundation-server-2010-beta-1.aspx
http://blogs.msdn.com/b/jimlamb/archive/2009/06/15/symbol-and-source-server-in-tfs-2010.aspx
From what I have read these are both useful server applications to setup for better debugging support when dealing with older versions of applications that require analysis.
In the first link the msdn blogger mentions that while both are useful they are seperate and don't depend on each other. Why would I want one and not the other? Do they perform two distinctly different tasks or do they overlap?
happy for others to edit Q or ask me to edit if this isn't clear enough.