At this point in time, if M365 is on a system the user can choose to use either Outlook (classic) or Outlook [which on some systems will have "(new)" and on others just read "Outlook."
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If one hits the Windows key and enters "outlook" in the search, you should have two different options, one of which should be Outlook (classic).
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Both Outlook (classic) and Outlook (new) [whether or not (new) is specified] should exist side-by-side, and be able to be used as desired, through 2029.
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Brian? ¡¤¡á?¡¤???? ¡¤?Virginia, USA?- Windows 11 Pro, Version 24H2, Build 26100; M365 Family; Android 13 (Xiaomi HyperOS 1.0.10.0)
It is much easier to be critical than to be correct.