Outlook Attendees Meeting

Question

Outlook Attendees Meeting

Kate 0

If you have already sent a a meeting invite with individual email addresses on it, and add a distribution list that has overlapping emails. When you send the updated meeting are the individual email addresses that are also on the distribution list going to have two meeting invites? I do not want the overlapping Distribution List members to be notified, but the list needs to be added.

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Answer 1

Hi @Kate

Thank you for clarifying the situation.

If you select “Send updates only to added or deleted attendees,” the update will still be sent to the distribution list you have just added. Outlook may not exclude members of that list simply because they were already invited individually. In my test environment, the overlapping members could still receive a meeting update through the distribution list.

I would also avoid removing the individual addresses and leaving only the distribution list. In my testing, when I removed a previously invited attendee, the meeting was removed from that attendee’s calendar, even though the attendee was also included in the distribution list.

I could not find an option in Classic Outlook to add the entire distribution list silently while preventing the overlapping members from receiving notifications. The safest workaround would be to expand the list, remove the people who are already invited, and add only the remaining members. You can then select “Send updates only to added or deleted attendees.”

Since this behaviour may vary depending on the Exchange environment, I recommend testing it with a small distribution list before applying it to the actual meeting.

I’m just a fellow community user, not a Microsoft employee, but I hope this helps. Please let me know if you have any updates.

Michelle Nguyen 2,615 Reputation points Independent Advisor

2026-11-02T07:39:09.25+00:00

Hi @Kate

Is there any update from you?

If yes, please feel free to let me know

Answer 2

An attendee listed both individually and through the newly added distribution list should normally receive only one delivered meeting update, but Outlook cannot exclude that attendee from the distribution list’s delivery while keeping the list on the invitation.^1^

What happens when you update the meeting

In classic Outlook:

Open the meeting from your calendar.
Add the distribution list to Required or Optional.
Select Send Update.
If prompted, select Send updates only to added or deleted attendees.^2^

This avoids sending the update directly to all existing attendees. However, the distribution list is considered a newly added attendee, so the update is sent to that address and then distributed to its members. Consequently:

A person included both individually and in the distribution list should not normally receive two copies solely because of that overlap.
That person can still receive one update through the distribution list.
The only added or deleted attendees option does not filter individual members inside the newly added list.

Exchange/Outlook supports representing a distribution-list address as the meeting attendee rather than explicitly listing every member.^3^

If overlapping members must receive no notification

There is no documented Outlook meeting-update option that adds the complete distribution list but suppresses delivery to selected members of that list. Use one of these alternatives:

Create a separate distribution list containing only the newly required attendees, and add that list instead.
Add only the non-overlapping members individually.
If administratively appropriate, temporarily use a purpose-built group whose membership excludes the existing attendees.

Do not simply save the meeting without sending an update: newly added attendees must receive a meeting request for the meeting to be added correctly; Outlook’s update model sends a new request to added attendees.^4^

Also note that external attendees always receive meeting-message updates for attendee-list changes, regardless of the update option selected.[^5^](https://learn.microsoft.com/troubleshoot/outlook/calendaring/send-updates-prompt-not-displayed ""Send update to attendees" prompt not displayed when updating meetings")

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