Sharing calendars with a big difference - please help.

I have opened up 4 additional calendars on my system for our 4 engineers (who do not have internet or email requirements - but do need to run calendars). i want to share these additional calendars Mandy - E1 Mandy - E2 etc with the other users on our network. No problem - UNTIL I came to the last person still using Outlook 2003 and she can only see my main calendar and not my additional ones that I have created.

PLEASE HELP !!