To go back to the original Outlook, open the new Outlook app and turn off the toggle in the top-right corner labeled “New Outlook.” Outlook should close and reopen in the classic version.

If the toggle is missing

  • Open Help in Outlook and choose Go to classic Outlook or Revert to legacy Outlook.
  • If Outlook asks for feedback, you can submit it or skip it, then continue.
  • If it still won’t switch back, classic Outlook may need to be reinstalled, depending on your setup.

Important note

This only applies to the desktop app experience; Outlook on the web may not offer a way to return to the old interface.

Quick steps

  1. Open new Outlook.
  2. Turn off New Outlook in the top-right corner.
  3. If needed, go to Help and select Go to classic Outlook.
  4. Restart Outlook and sign in again if prompted.

If you want, I can also give you the exact steps for Windows , Mac , or Outlook on the web.