For anyone genuinely struggling with this: There’s a setting in the Outlook options that will keep the invite in your inbox after you accept it.
I don’t have access to Outlook anymore so I can’t tell you where it is, sorry. It’s buried in that awful overwhelming interface somewhere, but hopefully knowing that it exists is a helpful starting point. Good luck.
Edit: Apparently they’ve removed this option in the “new” Outlook, my condolences if you’re using that one.


Pretty awkward when you forget/can’t find the event date though. I’ve managed to create an event in the wrong year at least once.