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Catch up on messages you missed on Mac
If you receive messages while you have notifications paused or you're away from your Mac, you can catch up on a busy conversation in two ways: you can jump to the first message you haven't seen or you can read a summary.
Jump to the first unread message
Go to the Messages app on your Mac.
Select an unread conversation, then click .
Your view of the conversation moves up to the first unread message.
See message summaries
If you have a Mac with M1 or later, Apple Intelligence can show you a summary of unread messages in a conversation. See Use Apple Intelligence in Messages.