Depending on your Outlook version, you may be able to use a .prf file to set a new profile or modify a profile. See http://www.slipstick.com/exs/olroam.htm for links to resources and documentation.

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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.outlookcode.com/jumpstart.aspx
> I need to change the mail server settings on 11,000 email clients, is there
> an easy way to do this? The clients are outlook and outlook express that
> pop.