Retention classes provide a means to consistently manage data that must remain in a namespace for a specific amount of time. For example, if local law requires that medical records be kept for a specified number of years, you can use a retention class to enforce that requirement.
Retention classes are defined on a per-namespace basis. The classes you create for one namespace are not visible in any other namespace.
You create retention classes in the Tenant Management Console. Users and applications can then use those classes as retention settings for objects.
This chapter describes retention classes and explains how to create, modify, and delete them.