From: Al on
Outlook 2007 Calendar
When an existing meeting has been updated and notification sent to
attendees, the recipients (invitees) do not see an indication in the Subject
line that the meeting has been updated. They have to open up the invitation
and what they see is the original date or time with a strike-through over it
and the new date and time beside it.
It's not obvious to the invitee that this is an update to an existing
invitation or a new invitation. It becomes confusing to the invitee and
causes the invitees to call the meeting organizer to clarify.
Suggestion for Outlook 2007
Could the word 'Updated' be added to the subject line when a meeting is
updated, as it was before with Outlook 2002and 2003?

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http://www.microsoft.com/office/community/en-us/default.mspx?mid=706631f8-1c3b-423d-ab6f-424082604b38&dg=microsoft.public.outlook.calendaring