I store most of my files on a central server so the first thing that I do after performing a new OS installation is to map a number of network drives. However, after installing Windows 8 I was initially confused as I couldn't find the option to map a network drive anywhere on the new ribbon interface.
It turns out that in Windows 8 the option only appears in the ribbon if you are currentlyviewing the Computer location (shown below). This is the initial location that is displayed if you launch windows explorer using the WIN+E shortcut.
Hopefully this post will help anyone else who gets equally confused!