View e-mail messages by conversation
When you arrange messages by conversation, messages that share the same subject appear together in the message list, even if the messages are contained in different folders. The messages within each conversation are sorted with the newest message on top. When a new message is received, the entire conversation moves to the top of your message list.
Icon for a collapsed conversation
Icon for an expanded conversation
Icon for unread message
Do any of the following:
Read messages that are part of a conversation
Turn off viewing by conversation