You need to set up Outlook Express with the correct names of the servers for your particular email account. One server name for outgoing mail, and one for incoming. The following link lists all the majors web mail services and their server settings.
http://www.emailaddressmanager.com/tips/mail-settings.html
In Outlook Express, from the Tools menu, choose Accounts.
On the Mail tab, choose Add --> Mail..
Type a display name for your account. Hit Next.
Type your email address. Hit Next.
Using the above link, enter the required information for incoming and outgoing mail servers. Hit Next.
Enter the username and password for the account and click Finish.
(These windows may vary slightly depending on the type of account.)
Hope this was helpful. You'll want to tell Outlook whether or not to leave the email on the server or not (for you to access from the web at a different location perhaps).
Not as familiar with Treo setup, but there is most likely a settings screen to enter the same info as above.
Best of luck!
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