OUTLOOK - CONVERSATIONS
Using Conversations in Outlook Live
Conversations allow users to group all messages with the same subject together into one item. This can help us keep track of messages and replies, parts of which are repeated in all new messages, into one coherent Inbox entry.
For example, if you have been sending and then replying to a message from a co-worker, back and forth, several times, you have a very long message with a lot of repeated data. Conversations can show us the entire exchange in a more concise grouped manner.