If she's using POP3 with Outlook Express, I would suggest changing to IMAP. The iPad's Mail app can then be configured with the settings and mail, both received
, will be available in both computers. POP3 will still work OK, but may not allow all
mail to be viewed in both systems. Sent mail will only be available in the computer from which it has been sent.
If the iPad is to be a "3G" model, the outgoing SMTP server needs to be that of the mobile phone provider. If it is a "WiFi only" iPad, the SMTP server needs to be that of the ISP whose WiFi connection she's using, which can change depending on where she's connecting.
The general rule
is that, to send mail, you must always use the SMTP server of the provider with which you've connected to the internet. The exception
is, if your home broadband ISP supports SMTP Authentication
(where you sign in with a Username/Password as with receiving mail), then you can use their server with any internet connection.
she would like to also use her iPad 2 to send and receive emails from Outlook Express using her iPad 2, how can this be done?
Messages will be sent and received using the iPad's own "Mail" application and has nothing to do with Outlook Express in the PC.