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When initially creating the meeting invitation, the meeting owner can send invitations based on whether the attendees are required to join the meeting or not.  

1. If an attendee is required to participate in the meeting, enter their email address in the Required field. If the attendee is not required to participate, enter their email in the Optional field. 

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2. After entering the email addresses of all attendees, click Send.

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How to invite additional attendees to a meeting after it has already been created.

1. Double-click the meeting in Outlook to open it, then add the new attendees in the Required or Optional field, depending on their role in the meeting. The Scheduling Assistant can also be used to confirm their availability. For more information about using the Scheduling Assistant, please refer to the following article: Scheduling Assistant in Outlook - desktop

2. Click Send Update.

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3. A new window will appear, requiring you to select between:

• Sending an update to modified attendees only
  or

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