A notice in the M365 Admin Center for M365 Business admins, but it's clearly happening for M365 Personal/Home too:
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Microsoft Outlook: Updated behavior for switching back from new Outlook to classic Outlook for Windows
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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.
?????? ~ Benjamin Disraeli, 1804-1881