configure Outlook 2007 to access Outlook Web Access email

I know this must be a dumb question.
I work for multiple clients at a time and have seperate email accounts at each client site. I can access all my email in Outlook 2007 except for one client who I only have email access using Outlook Web Access on my computer or Exchange on my iphone.

Is there a way to pull the OWA email or iphone exchange email into Outlook 2007 on my notebook?

Thanks