Certain users want to collaborate on spreadsheets, opening and adding to the
workbook simultaneously. They also want to be able to publish the workbook
to a larger community of intranet users who only need simultaneous viewing
and printing rights. To accomplish this, is it correct that on the server
side we need SharePoint Server 2007 and Office Enterprise 2007, and that on
the client side our full access users will need Office Pro Plus 2007 in order
to create and develop the spreadsheets?

Thanks!