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Creating and Deploying Outlook Web Access Themes

About Premium and Basic Clients

Outlook Web Access is optimized for Microsoft Internet Explorer 6 and later. These clients are known as premium clients. Outlook Web Access also provides a basic e-mail experience for other browsers including Internet Explorer 5.01 and Netscape 4.8 and later. Unfortunately, not all basic clients fully support cascading style sheets, so for these clients you will not be able to provide rich theme support.

PS: Xbox Outlook theme. Brilliant.