Here's how to access this option in Outlook 2010:
1. Open Outlook and switch to your inbox.
2. Make sure the Home tab is selected.
3. Near the right side of the Ribbon you'll see a Find section; click Filter E-mail, Unread Mail.

Presto! Now your inbox will display only those messages that are marked as unread. Don't worry, the rest of your mail is still there; you can click Close Search up in the Ribbon to return to the standard view.
While you're at it, check out the other handy filter option in that menu: Has Attachments. That's great if you want to see only those messages that, well, have attachments.
Omar Ortiz
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