Missing delegate tab in Outlook 2002

I work in a small office, 4 PCs, and we are trying to get Outlook to communicate between the computers. When we go to Tools, Options, we are supposed to have a Delegate tab, but there isn’t one on any of the computers.

we want to set it up so that all 4 PCs can view, edit items on the calender.

Please help!

Thank you!