I had a similar issue with a user and found the solution for her.
After some googling I found out that this is a part of the 'Microsoft 365 Features' specifically 'Shared Calendar Improvements' which is default on OWA. On the Windows application you can turn this off by doing the following:
- Right click Mailbox
- Data File Properties...
- 'Advanced' tab
- Untick 'Turn on shared calendar improvements'
Hello @Yuki Sun-MSFT ,
Attached is a picture of my Outlook version:
I have two issues. And the issue you presented was for removing adding attendees. That problem is happening across the board on my own calendar, and as an editor delegate for three other calendars. I found that I don't get the options to notify added/deleted attendees in the pop-up window for any of my updated invitations anymore. That feature is gone!!!!
Another inconsistent issue, meaning it doesn't happen with ALL my meetings. I opened an old recurring meeting invitation in a calendar that I manage. I selected only the Just this one appointment in a series and I added an attendee. It sent the invitation to the new attendee but send a cancelation to the attendee that was already there! Huge problem.
Hi @Edith Badkar ，
For the first issue, in order to help narrow down whether there's any third-party add-in which may interfere with how Outlook triggers the "Send update to attendees" dialogue box, I'd suggest trying to launch Outlook in safe mode and see if the issue persists:
For the second issue, as it occurs randomly, it could be more difficult to troubleshoot. Given this and considering that both the two issues are related to send meeting update, personally I'd recommend let's first focus on the first issue and see if the second one can be solved together with it.
Hi @Edith Badkar ，
Just checking in to see how things are going on with this issue. Do you have had a chance to try running Outlook in safe mode and check the result?
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