Palm Treo 800w

Please forgive me for my ignorance - I am not currently a user of these types of phones. However, I am getting an 800W this week specifically because I need to have access to my business e-mails as soon as they arrive. My question is - I just watched the quick info video on the 800W and they specifically said that you can "read Outlook e-mails as they arrive". Does that mean that I cannot read (or get alerted to) OTHER e-mails (such as AOL) as they arrive?