Update 4811 If you have access to someone's mail, you cannot see if that person has read in their mail or calendar. The read and unread marks are kept for each user (so you can only see what you have read). The only way to see what that person has read would be to use their ID file, which is ...

In Notes 8.5.2, you can make a contact or group private, to hide it from anyone who has access to your contacts but not your mail. If someone has access to your mail, then he or she can see private contacts and groups. To mark a new contact or group as private, click the Mark Private check box ...