Might be nothing, but check this out.

[everluck]

I have walked the edge of the Abyss.
I have governed the unwilling.
I have witnessed countless empires break before me.
I have seen the most courageous soldiers fall away in fear.

I have seen your future.
And I have learned.

There will be no more Sadness. No more Anger. No more Envy.

I HAVE WON.

Oh, and your poet Eliot had it all wrong:
THIS is the way the world ends.

Posted by a MS employee on another forum, with the message "from a friend of a friend."

It's probably nothing more than his contribution to our confusion, but if you guys can figure anything out, there ya go.

[Avateur]

Cortana Letters.

[everluck]

Ah, I see.

Cool that they might be bringing this full circle then

He also said to keep an eye out on the viral video blade of our 360s.

[Mrguy]

I was gonna say I knew I heard that somewhere

http://marathon.bungie.org/story/cortana.html#1

[halcyoncmdr]

Yeah, there was a microsoft guy on another forum that told those there that they should watch the viral videos page as well... I never even had noticed it before, probably because it didn't have any videos

[Mrguy]

ALSO:

http://en.wikipedia.org/wiki/Cortana_Letters