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There are two types of Office 365 for Enterprise plans: Plan K (for "kiosk" workers) and Plan E (for information workers). Plan K doesn't include messaging and collaboration features or functionality.
There are three different Plan K offers. Hosted Exchange Online only is available for $24 per user per year. Hosted Exchange plus Hosted SharePoint (Plan K1) is $36 per user per year. And Hosted Exchange, Hosted SharePoint and Office Web Apps access (via SharePoint) (Plan K2) is $120 per user per year.
There are four different Plan E options, ranging in price from $120 per user per year, to $324 per user per year. These are known as E1, E2, E3, and E4. Both the E3 and E4 options include for each user a copy of Office Professional Plus -- Microsoft's highest-end Office 2010 SKU -- to be used on client PCs.