Configuring preferences and options in Outlook.com
@CW said
All my Notes in my Outlook folder are missing.
1 -- When you say "Notes", do you mean Outlook Notes (below), Microsoft OneNote, or a mail folder named "Notes"?
2 -- Which product are you using when you look for the missing items: Outlook Web ( https://outlook.cloud.microsoft/ ), Outlook for Windows (classic), New Outlook, or Outlook for iPhone?