TouchDown HD for Tablets is an android app that syncs emails, contacts, calendar and tasks from your corporate Exchange server on your Xoom tablet. The app gives you a single tabbed view.
Although the Xoom tablet has built-in email and gmail clients, TouchDown HD is what I use for my corporate mail. The app proxies Exchange PIN and remote wipe enforcement to it. A stock Honeycomb app works very well.
Download TouchDown HD for Tablets (Free) from Market.