The Outlook client does not need to be on. However I will warn you that the
recall feature doesn't work most of the time.

"Jen" wrote in message
...
I tried to recall a message from a person I knew was out of the office for
a
few days and I wonder do I have to try to recall this message when they
are
there with outlook on or will it automatically try to recall it when they
are
back in the office.