If you're using Outlook, a useful feature is the Conversation view. This view groups your emails according to particular conversations. Where there have been a series of emails between recipients on a particular topic, they are grouped together and shown as a thread, known in Outlook as a Conversation.
You can turn the Conversation view on and off at any time and your message list will re-organise itself according to the option you chose.
Follow the instructions in the relevant Microsoft Guide:
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