If I use web mail, can I still use my normal email program (such as Outlook, Eudora, or Netscape mail)?

Yes, however, keep these important notes in mind:
Any email messages that you check through web mail will NOT leave a copy on the server. If you check an email message through web mail, you cannot check that same message again in your email program.
If you wish to check an email message in your email program first and then later check the same message in web mail, you must chose the “Leave mail on server” feature in your email program’s settings.