When it comes to personal use of the organization’s IM system, employers have a broad range of choices. You can ban all personal use, allow a limited amount of authorized personal use, permit unlimited personal use, among other options. Whatever approach you select, be sure to clearly define your personal use rules and guidelines in your written IM policy. Be specific. Leave no room for employee interpretation. Make sure employees understand that usage guidelines apply, regardless of whether the organization’s IM system or employees’ personal IM clients are used.