From classic Outlook, turn on Try the new Outlook once so both apps are available. Then toggle back to classic as above. Pin both Outlook (classic) and new Outlook icons to the taskbar or Start for easy access. Mail, calendar, and folders in Exchange/Outlook.com accounts remain intact; reverting only changes which client is used to access them.
To switch from the new Outlook for Windows back to the classic version, follow these steps: Open the New Outlook: Launch the new Outlook application on your Windows device. Locate the Toggle: Look for the toggle option, which is usually found in the top right corner of the Outlook window.
To get classic Outlook working again and reinstall it on Windows, use the official classic Outlook installer instead of relying on the “go back to classic” button or Store-only options.
Try to launch Classic Outlook Directly Using the EXE. Sometimes the New Outlook hijacks the shortcuts. Try launching classic Outlook manually: Press Windows + R Paste this path and press Enter: ... or for older installs: ... If Classic Outlook opens normally, re-pin it to the taskbar and stop using the New Outlook shortcut. See if this helps.
To install Outlook Classic on a new laptop that comes with New Outlook, you can follow these steps: Check for Side-by-Side Installation: If your organization permits, you can have both Outlook Classic and New Outlook installed simultaneously. This setup helps users transition more smoothly.
Open Start and look under “All apps” for the classic Outlook icon (different from the new Outlook icon). Classic Outlook is a separate desktop app. Confirm classic Outlook is actually installed: If the device originally came only with new Outlook and classic Outlook was not installed via the standalone installer, it will not appear.