You are right to be concerned. It is not always easy to "harvest" them en masse through the UI, but it's a piece of cake for a little code, which is what a spambot installed on a recipient's computer would be using.

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Sue Mosher, Outlook MVP
Author of Configuring Microsoft Outlook 2003
http://www.turtleflock.com/olconfig/index.htm
and Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers
http://www.outlookcode.com/jumpstart.aspx
> When I receive an email with 200 recipient email addresses in the "To"
> field, I often contact the sender telling them to please either set up
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> click on each name and see the email address, but I cannot figure out a
> way to extract them en masse.