Calendar items not sent to new members of group

Hi kkostas,

Outlook does not automatically update calendar invitations for existing meetings when there are changes to group memberships.

To ensure that new group members receive invitations to existing meetings, you can use these solutions:

Resend Invitations Manually

1. Open the calendar event that you want to update.

2. Make a minor change to the event, such as adding a space or a character to the description.

3. Save the changes to the event.

4. Outlook should prompt you to update the meeting. Click "Send Update" to resend the invitations to all attendees, including the new group members.
   
   Change an appointment, meeting, or event - Microsoft Support

5. The new group members should now receive invitations to the updated event.

Use Distribution Lists (Contact Groups) in Outlook

You can also consider using distribution lists (also known as contact groups) in Outlook instead of directly inviting a group of people to a meeting:

Create a contact group in Outlook - Microsoft Support

1. On the Navigation bar, choose People 

2. Select Home > New Contact Group.

3. In the Contact Group box, type the name for the group.

4. Select Contact Group > Add Members 

    

   , and then select an option:

   • Select From Outlook Contacts.

   • Select From Address Book.

   • Select New E-mail Contact.

5. Add people from your address book or contacts list, and choose OK. To select multiple people, hold down the Ctrl key as you choose members. 

6. Choose Save & Close.

7. When you schedule a calendar event, invite the distribution list (e.g., "Project Team") as an attendee. When there are changes to the group membership, update the distribution list accordingly. New group members will automatically receive invitations to events where the distribution list is invited.

Using distribution lists provides more flexibility in managing group memberships and ensures that changes to the group are automatically reflected in calendar invitations.