My Windows 8 Laptop will open Bing in IE by itself. It makes a request to:
which then directs to
Changed default browsers from IE to Chrome and see the same behavior in Chrome.
My initial thought was spyware, but the Microsoft URL made me think otherwise. I then confirmed that it happens on brand new installs for others at my company.
It happens (seemlingly) randomly, and without any interaction from me. I can reproduce the issue by disabling my network connection and resuming from sleep mode.