When working on cases it is often required to reach out internally. If doing so by email using the built-in email functionality of CS app, it is not possible to see, whether a contact (internal) is available or not. It would be nice to have the same feature as in Outlook, where, before sending an email, it can be seen, whether a contact has set an out of office reply or not. This of course only refers to internal contacts (i.e. same Exchange Server).