Take a look here, it may help:
http://www.slipstick.com/outlook/share.htm
"Kelly" <(E-Mail Removed)> wrote in message
news:191AC217-6DB2-433D-B09C-(E-Mail Removed)...
>I am an Assistant and I want to share my calender with my boss so that he
>can
> see his upcoming appointments as well as what has occurred in past
> meetings.
> I am currently running Outlook 2007 and he has an older version that I
> believe is the 03 version. He is also using Outlook Express. He doesn't
> mind switching to the full program of Outlook to make this an easier
> process.
> Is this possible? If so, how?