Categories are another organizational step where the administrator creates named categories, their relevant archiving policy and can associate, within this structure, previously defined rules. Alongside the pre-defined Group further access rules can be set parallel to the existing Group rights e.g. "The sender and recipient have access" or "Only the user who has filed the email" or "All have access" or the user can decide who will have access to the E-Mail. Of course, "Read permissions" and "Write permissions" can still be explicitly set for each created category.