Why can I only see one day at a time in Outlook Web Access?

Answer: 

[DEPRICATED]

There are two versions of the Outlook Web Access (OWA) interface for Exchange 2007:  the premium and the light.  The premium interface is only available in Windows Me and newer running Internet Explorer 6 or higher.  For all other operating system/browser combinations, the only available option is the light interface.  Within the light interface, the only calendar view available is the day view; the week and month views are not available.