Usually, you will want certain categories to apply only to certain data types in OfficeTalk. For example, you might wish to associate a category such as 'Customer' with a company or contact but you may wish to associate a category such as 'Personal' with Task, Company, Contact and Planner data types. OfficeTalk lets you do this using Category Sets.
A Category Set is a named list of categories which may be assigned to one or more data types. This means that the categories contained in a particular category set will be available from within the Category page of only certain OfficeTalk data property sheets.
OfficeTalk is supplied with a number of category sets, however, you may create your own categories and category sets. For more information on defining Category Sets, see Administering Categories.