There are old videos that was hosted on mms://wm.microsoft.com/...... , which cant be found now, at least not working for me.

for example, this one http://channel9.msdn.com/shows/Going+Deep/Singularity-Revisited/
mms://wm.microsoft.com/ms/msnse/0512/26042/GoingDeep_SingularityII_MBR.wmv