Why does Microsoft keep switching me from Outlook Classic to New Outlook when I do not have that option enabled?

Barry Morse 20 Reputation points
2025-12-20T00:00:40.68+00:00

I use Classic because Outlook New constantly loses inbox emails by the hundreds. I don't want the OS trying to switch me from Outlook Classic to Outlook New. But it does that every single day. How do I get it to stop switching me?

Please answer in 25 words or less. I won't read past that.

Microsoft 365 and Office | Other
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Answer recommended by moderator
Diane Poremsky 8,265 Reputation points Independent Advisor
2025-12-20T00:54:06.07+00:00

If that key doesn't work, use HideNewOutlookToggle - when the toggle is hidden, Microsoft won't enable new Outlook. (And you can't accidentally hit the slider.)

HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Options\General DWORD: HideNewOutlookToggle Value: 1 https://www.slipstick.com/outlook/classic-outlook-not-new-outlook/

As an FYI, many Outlook keys don't exist until you either change a setting in Options or add the key yourself. Since there is no option in Outlook for these settings, you need to add the key.

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  1. Barry Morse 20 Reputation points
    2025-12-20T00:22:29.88+00:00

    Answer accepted, except that the named DWORD does not immediately exist in my Windows 11 installation. I added the DWORD as follows:

    [HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Options\General] "NewOutlookAutoMigrationRetryIntervals": dword:00000000

    I also added New Outlook MigrationUserSettting DWORD under Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\office\16.0\outlook\preferences

    Hopefully one of those will work.

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  2. AI answer

    2025-12-20T00:00:50.73+00:00

    To stop automatic switching, disable the NewOutlookMigrationUserSetting registry key or check your organization's migration policy settings.

    AI-generated content may be incorrect. Read our transparency notes for more information.

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