Isn't this the same as webmail?
No, webmail is a way of viewing uncollected emails only. OWA gives you access to all your new mail, collected mail and folders. Unlike webmail any messages you reply to will be in your sent items folder when you get back to base. In fact any changes you make to your Email folders, Calendar, Contacts, Tasks from the website will be reflected in your Outlook when you get back to your computer.
How do I get Outlook Web App?
OWA is available as part of easykey's premium email service called Xmail.