Exchange 2000 address list/contacts

Have Dell server running SBS 2000 and using Exchange 2000
as email server. We want to be able to setup an address
list/contact details for all users to access (prefer only
one user to update) when sending email. Have tried
following the instructions, create new address list, r-
click properties, and set users to have read/write etc
permission but when access this list in Outlook get you do
not have permission to add to list error. Can add contacts
through outlook but only shows on that users outlook.
Hoping someone can point me in the right direction, thanks
in advance.