Don't use the address book. Go to your Contacts folder, switch to the By Category view, select the category you want to send to, then choose Actions | New Message to Contact.

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Sue Mosher, Outlook MVP
Outlook and Exchange solutions at http://www.slipstick.com
Author of
Microsoft Outlook Programming: Jumpstart
for Administrators, Power Users, and Developers
http://www.slipstick.com/books/jumpstart.htm
> Say I want to bulk email to everyone in my address book
> who is listed under the category 'business'. I can't
> figure out how to do it. Why would there be a category
> sort if all you can do with contacts, once sorted, is
> look at them on your screen? Maybe I just can't figure
> it out...