I would like it for my email sent to look like it's from another
address, say ', then the reply-to field to
be my personal email.

I know this is possible by modifying the header of the emails, but how
is this done within outlook 2000/2003? I'd like this policy to be
spread across all the office computers, even if it needs to be done on
a case by case basis.

Alternatively, is there a macro that i could write to do this everytime
a message is sent or is added into the outbox? what objects would I
need to manipulate? and how would I attach this macro to trigger on
this event?

Thanks