In some cases, Bit Titan Support has received reports of this issue with OWA, but not Outlook.Events are changed the same way as appointments or meetings, unless you have an all-day event such as a conference.If you want to keep the event as an all-day event, but show the time as something other than free on your calendar, change Show As.If you've noticed missing calendar appointments (e.g., lost meetings, delegate issues), or meeting updates from someone other than the original organizer, you're not alone.The only workaround now is to end the series and create a new series with the new details, but this seems unnecessarily cumbersome and breaks continuity with the rest of the series.Outlook was designed to send updates when you change the location or time of the meetings because the attendees need to know when and where the meeting is.
Based on the information provided in the URLs above, this problem has been randomly affecting users for years.
Please allow changes to be made to a series of appointments such that the change only affects future occurrences. As it stands now, any changes made to a recurring appointment change all historical instances of that series including any that had been individually modified.
This can cause a lot of confusion when looking back at past appointments for historical record keeping.
You also can't avoid sending an update when you add a attendee, for the very same reason.
Adding Notes to a meeting request should never send updates.