I have a client who has set up a meeting and sent an update and the following
occurs: "once I sent an update, my attendees changed to “optional” from
“required” and the tracking is inaccurate as someone who accepted is not
showing up as receiving a response. Another attendee did not receive the
update at all."

She also is asking whether or not it makes a difference is she uses a
distribution list in her meeting invitation.

Can anyhone shed any light on why this is happening?
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LPS