Shared calander

Have Outlook 2000 on personal computer running Windows ME.
Have set up users for each member of family so each must
log in to computer. With original installation when we set
up the individual users our OUTLOOK was the same no matter
who was logged in. After reformatting hard drive the
outlook is locked to each user and not the same for all.
I would like to share at least the calander. Am not sure
if problem with Outlook setup or how the users part of ME
is set up. We do not use Outlook for e-mail