I thought I’d share something that I ran into after I installed the Office 2013 Customer Preview on a Windows 8 system.
Before Office 2013 was available, I’d been using the Mail Metro-style app. After I installed and configured Outlook 2013 I noticed something strange. When I’d click on e-mail addresses in messages from Outlook 2013, I’d be prompted to either open the Mail app or use them in Outlook 2013. This got annoying fast. Fortunately, there is an easy fix.
From the start screen, show Charms (either swipe or press WinKey-C) and click Search. Search for “default.” Click on Default Programs.
Click on Set your default programs
Click on Microsoft Outlook and then click on Set this program as default
Tom on Tech 
Im trying to do this but outlook isn’t listed in the default programs list??
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Did you ever get this issue resolved?
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Same problem here, Microsoft Outlook does not exist in that left hand pane.
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