Reply Zero is in Early Access and is not yet available on all accounts.
To Reply when you owe a response and Awaiting Reply when you’re waiting on someone else, and the labels are visible in your regular email client too.

Open Reply Zero
Open the account menu at the bottom of the sidebar and choose Reply Zero. On first use, follow the onboarding steps to enable the reply-tracking rules.Lists
To Reply
Incoming conversations that appear to need your response are labeledTo Reply. The Reply Zero view shows them on the To Reply tab and provides a Reply shortcut.
Waiting
Sent conversations that appear to require a response are labeledAwaiting Reply and shown on the Waiting tab. Use Nudge to open the thread and prepare a follow-up.
Done
Choose Mark Done when a conversation no longer needs attention. It moves to the Done tab. You can restore it with Not Done if necessary. Use the time-range filter to focus on newer or older conversations.Follow-Up Reminders
Open Assistant > Settings and configure Follow-up reminders to choose how many days to wait and whether Inbox Zero should automatically draft a nudge when you are waiting. Saturday and Sunday do not count toward these thresholds. Use Find follow-ups to scan existing mail immediately. Matching conversations receive aFollow-up label or category.
To receive reminders in Slack, Microsoft Teams, or Telegram, enable follow-up delivery for the connected account on the Channels page.
The Reply Zero view is currently available for Gmail accounts. On Outlook, use the
To Reply, Awaiting Reply, and Follow-up categories directly in Outlook instead.