Vista Business and OL2007 in Office 2007.

I wish to send e-mails from my home computer as though they were coming from
my company computer and arrive as if sent from my work computer and their
e-mail system. Can this be done? My home e-mail is (say) Johnsmith@xyz.co.uk
and my Company e-mail is Jmith@mycompany.co.uk I just want to use my company
address while working at home. All mail to me that goes to the company is
re-directed to my personal e-mail already. My company uses OL2002 and they
have a server.