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Open the meeting request in classic Outlook, select Propose New Time and select Tentative and Propose New Time or Decline and Propose New Time.
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In the Propose New Time box, select a proposed new time.
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Select Propose Time to open a revised meeting request with "New Time Proposed" in the Subject line.
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Select Send.
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Double-click the meeting invitation to open it in classic Outlook.
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Select Propose new time, then select I might attend or No, I won't attend.
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Select a different time slot to propose, then choose Done.
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Under Propose new time, add a message if you like.
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Select Send.
