Last resort if New Outlook Toggle slider does not work. By following the steps below you can force the old version.
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Go to Registry Editor
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Navigate to the following Pathway
- Computer\HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Preferences
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Find at the bottom UseNewOutlook and double click this.
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Change the Value to 0
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Restart Outlook.
NOTE: This option may not be available in more recent updates.