Here are the requirements to run standard Hosted Exchange. If you are using a wireless device, please refer to Wireless Services.

On PCs, to run Outlook 2003, PCs need to have either Windows 2000 or Windows XP installed (with at least Service Pack 1). To run Outlook Web Access (OWA), Internet Explorer 5.5 (or higher) or Firefox 1.0.5.

On MACs, to run Entourage on MACs, they need to run OSX. To run Outlook Web Access (OWA), they can run either Safari or Firefox.