In order to give you an overview about your email communication, Crawler groups all replies with their original message, creating a conversation.
When you open one message in a conversation, all of your related messages will be stacked neatly on top of each other, like a deck of cards. We call this "Conversation View". In Conversation View, as a new message comes in, it is stacked on top of the ones that came before it, so that the newest message is the one that you see first.
This feature might slightly slow down viewing of the messages.
To view the message in a conversation, click on the "View conversation" link at the bottom of the message.