There is no such setting, nor any need for one. Just use Tools | Accounts to add the email account you need.

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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
> My school currently uses Outlook 2000 in the corporate
> mode. Our district is updating some hardware and software
> to Windows XP and Office XP. I can't find how to install
> the corporate setting in Outlook XP so as to work within
> our existing system. I have been told that this is not
> possible. Please advise. Thanks.