I have connected my Windows Live account (Microsoft account), Facebook account and Google account with Windows 8.
In the "People" Windows 8 app it shows as connected to Microsoft, Facebook, Google, but in the "Messaging" app it's connected only to Microsoft and Facebook.
While I can chat with Facebook online contacts and in Messaging, I can't find my Google online contacts in the Messaging app.
Seems like Google supports only sharing of contacts and not chat as of now. Does anyone knows how to get Google chat on Windows 8 Messaging?