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Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.
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While the new message is open, that you're composing, click the arrow next to Options to display the Options menu, click Bcc.
http://support.microsoft.com/kb/299804
Then put your distro list in the BCC field. That prevents recipients from seeing the list.