As a public service, I pass along some info from today's work activities.
I have discovered 
that something has changed everyone's Outlook calendar settings (in our organization, at least, some recent update perhaps?), without 
permission.
If you organize meetings using Outlook, you need to 
check and/or correct your settings, here is how..
In the Main outlook 
window, go to
  Tools | 
Options
Then click on 
Calendar Options, and uncheck "Allow attendees to propose new 
times for meetings you organize"
Once this is 
unchecked, you can OK your way back out, and all new meetings should be safe 
from proposed changes (which have the un-intended consequence of wiping out the 
original meeting request, and any attachments or history included with 
them).
I have not found the 
exact cause of this change, and will continue to investigate, to prevent its 
recurrence.
  
--Mike--

