If you logged into your Live / Hotmail account, you will notice that Microsoft updated it’s mail system:
You spoke, Hotmail listened
Over the past year, many of you told us that you wanted a cleaner, faster Hotmail. We released the new Hotmail to meet those needs, and now we’re adding more improvements based on your feedback.
In this version, we’ve changed the way that scrolling works for users who have the reading pane turned off. It’ll look more like Classic Hotmail if your reading pane is off.
Even more improvements are coming soon—we’ll be moving the advertisement from the top of page to the side, adding more themes, increasing the number of messages on each page, and adding the ability to send instant messages from your inbox.
We appreciate all your feedback and want to thank you for using Windows Live Hotmail.
Well…. Thanks Microsoft! 
Related posts:
Microsoft DPM
MicrosoftExchange
Nerd with a .45
PowerShell