Hi I found a workaround to this problem:

If you open up any of the accepted or declined messages that was returned to
you for the meeting, it will have a section that says "Accepted" and will
have all the addresses of people that have already accepted the invitation.
You can just highlight then copy and paste to new mail message so you can
send to all who have accepted. Also able to send to all that have declined as
well, as the returned message will also have a declined section. However the
only drawback is you cannot send to the no reply people.

"Bruce" wrote:

Outlook allows you, under the Actions menu, to send an email to all meeting
attendees. This is really a misnomer, since it creates an email to EVERYONE
that was invited. Only the ones who accept will be attending and I would
like an easy way to send an email to just those individuals.

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