I have a Blackberry Curve 8330 and cannot see my outlook email.

On your outlook you need to set it to leave a copy on the server (if your are using POP) contact your email provider to assist you how to do that

There is an option in Outlook with a Checkbox that says "Leave a Copy of Messenges on Server." Under Tools, then Options. That box must be checked, otherwise when mail co Almes into Outlook on your computer, it will never come in on your phone. There is also an option on your phone to have messages deleted from the computer when you delete email messages from the computer and vice-versa. Best recommendation is to pull-up the very-large user-guide on Blackberry.com, look at the table of contents and you'll see what I'm talking about under Email settings, with exact instructions of how to resolve your issue on the Curve.

Your BB cannot see outlook email. I am assuming that your AT&T email is setup on your computer with outlook? Outlook receives email from your email account just like your BB receives it from your email account. If it goes to your outlook and not your BB then you have to change settings on your outlook to "leave messages on server". Then you will receive it both places.

It sounds like you need to check your Outlook settings for the email account, there is an option to leave local copy on server.