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You can make Outlook open automatically when you click a link to send e-mail (sometimes called a "mailto" link) in a document or on a Web page. Similarly, you can make events and contacts open in Outlook when you open them from the Finder or the desktop.
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On the Outlook menu, click Tools > Accounts.
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Select the account you want to make the default.
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Click the Settings icon at the bottom of the pane,
and then click Set as default.
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On the Outlook menu, click Preferences.
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Under Personal Settings, click General
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Under Default application, click Make Default.
