Who is Cortana, anyway?

Wow. I thought I had a handle on Cortana… but I’m starting to wonder. The speculation today started with Mark Simmons – he brings up some pretty intriguing points. Even if you feel you can slough off most of what he says, though… check out barkbat’s reply. Wow – there’s some serious food for thought in there. (It should go without saying that posts like these are FULL of spoilers – but I’m saying it anyway.)