You must be the owner of a meeting to add attendees. Here's how:
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From a new or existing meeting, select the Scheduling Assistant tab.
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Select
  Add Attendees, then choose attendees from the Office Global Address List. (To search for someone, enter a name in the Search box, then press Enter.) -
Select the name from the list, then select either Required or Optional to add the selected name to that category of the meeting invitation.
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When you're done, select Send Update to deliver the updated meeting invitation.
(If the only change to the meeting is the attendee list, after you click Send Update, Outlook will give you the option of only sending the update to the affected attendees.)
If you're not an owner of the meeting, you can still forward the meeting to someone else. The meeting owner will be notified.Â
You must be the owner of a meeting to add attendees. Here's how:
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From a new or existing event, select the Scheduling Assistant tab.
If you don't see Scheduling Assistant on an existing event, select Edit first.
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Under Required attendees, select Add required attendee.Â
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Enter a name to search for, then select it. Repeat steps 2 and 3 as needed.
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When you're done, switch to the Event tab, and select Send to deliver the updated meeting invitation.
If you're not an owner of the meeting, you can still forward the meeting to someone else. The meeting owner will be notified.Â
You must be the owner of a meeting to add attendees. Here's how:
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Open the meeting invitation, then select Edit.
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On the toolbar, select Scheduling Assistant.Â
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Select Add required invitee or Add optional invitee.
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Enter a name to search for, then select the name of the person you want.
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When you're through, select Done, then select Send to deliver the updated meeting invitation.