Preupgrade fc15->fc16

Wed Feb 20 17:35:26 UTC 2013

I just completed upgrading a FC14 virtual machine running under virtual 
box and it went pretty well.  Now I am trying to do the same upgrade 
only on a FC15 standalone machine to FC16.  It looks like it can't find 
any of the FC15 repos which is odd since FC14 went so well.  Should I 
expect this to work or is the FC15 release just too old?  Why did the 
FC14 upgrade go so well?

TIA - Tod