You can also just pause your message syncing whenever you feel like it by tapping menu icon>Pause. This will automatically stop Outlook.com from syncing new messages for a specified period of time. The default is one day, but you can increase the pause length to as long as 14 days, a helpful feature if you're going on vacation.
It's a shame that Microsoft didn't overhaul the Outlook.com app with a more Metro feel, the way it did with the SkyDrive app for Android released in August. Changing the basic look and feel of the Outlook.com app may have also prompted the company to simplify the app and get rid of the tabbed menu bar at the top.
If you're already an Outlook.com or Hotmail user, then you might as well use the Outlook.com app. But if you're one of the supposedly numerous people tempted to jump from Gmail to Outlook.com to use as your permanent e-mail service, you might want to hold off on that switch until Microsoft comes up with a better looking and simpler e-mail app for Android.
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