Andy Fenton sent an all day event to IT shared calendar for 1 February.
It does not appear in the IT caledar, but it does appear in Richard
Brown's. It was an all day event and is showing as tentative, but
because it appears in Richard's calendar it looks like he is busy the
whole day - it appears he can still make appointments in it though.

My manager regularly works from home and puts the days he does this in
advance into the IT Shared Calendar, which is in the public folder, and
to which everyone in the IT department has publishing editor rights. He
places the appointment into his own calendar, sets the time as 'out
of office', adds 'IT Shared Calendar' as a required attendee, and
then sends this appointment. The appointment appears in his own
calendar correctly, but bizarrely enough instead of being inputted into
the IT shared calendar within public folders; it appears in the
calendar of the help desk manager instead, which is completely useless
to everyone else in the department.

Is there any reason why this appointment gets sent to another user's
mailbox calendar instead of the public folders IT Shared Calendar? I
really am puzzled.