Microsoft by (most) of the Numbers

Microsoft launched a new site, Microsoft by the Numbers which highlights all their product stats like:
over 170,000 apps for Windows Phone
over 2 billion minutes per day spent by Skype users
76 million XBox 360 consoles sold to date
It looks like they’re missing a big number though.
Where’s the $900 million write down for all the unsold Surface RT tablets?
I couldn’t resist. Microsoft, you set me up for this.