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Outlook | Windows | Classic Outlook for Windows | For business
Using classic Outlook for Windows in business environments
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Thank you for posting your question in the Microsoft Q&A forum.
You can switch back to Classic Outlook as long as it is still supported by Microsoft.
You can turn off the switch button to New Outlook for entire organization.
Please follow the steps here to disable it.
Control installation and use of new Outlook | Microsoft Learn
I hope this information helps.
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