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After tapping the three dots on the bottom right, you will see the labels of the bottom icons and any other menu items that appear under the icons.
Many of the apps work in both portrait and landscape and as you can see here email looks good in landscape. Notice the icons that were on the bottom are now on the right and have auto-rotated to match the landscape orientation.
As a fan of the Zune HD, I was please to see that Microsoft provided the full Zune HD experience on the WP7 platform.