If I open any meeting in Outlook 2016, then close without making any changes, it always prompts to save changes. This only started happening recently. It doesn't happen for appointments. Any ideas on why this might suddenly be happening, and how to stop it?
UPDATE: While this does not seem to be happening on current versions of Outlook, a related issue with slightly different repro steps still happens as described in the feedback link to from this answer.
I believe the issue is that when you click on a link (e.g. to open a Zoom or Webex link) you have clicked into the body of the meeting causing the application goes into Edit mode. Once it's been in edit mode, it cannot be closed until you save or discard changes.
Try to open Outlook in safe mode : Outlook.exe /safe.
If this no longer happens, then the problem is with some installed add-on. Try in this case to disable add-ons until you find the problematic one.
Do you open an attachment in the email? This could error if you have opened an attachment of that message.
If this is not your case, I think this may be related with data file. You can repair outlook data files to see if it helps. https://support.office.com/en-us/article/repair-outlook-data-files-pst-and-ost-25663bc3-11ec-4412-86c4-60458afc5253
Found the answer on another web site. "I have discovered that if I open the meeting on my main laptop screen, I don't get the prompt to save changes. However, if I open the meeting on my extended desktop screen, the prompt is displayed every time."
