Have been using Outlook for some years and often forget to activate my e-mail
away message when I'm out of the office. Since it's possible to set calendar
entries to show that I am out of the office it would be great if when
detailing such an entry I could "attach" a tailored e-mail away message to
the entry that would be automatically activated and deactivated for the
calendar entry's duration.

Such functionality would also allow use of the standard away message to be
just that - standard - with no need to change it every time, stating dates
and times of absence . Just click and run, when you have to leave the office
at a drop of a hat.