I believe this issue is this: Just because you're the Exchange administrator doesn't mean you have access to users' mailboxes. That's a change in Exchange 2000. You'll need to use an account that does have the necessary permission on the mailboxes or grant such to your admin account.

Signature
Sue Mosher, Outlook MVP
Outlook and Exchange solutions at http://www.slipstick.com
Author of
Microsoft Outlook Programming: Jumpstart
for Administrators, Power Users, and Developers
http://www.outlookcode.com/jumpstart.aspx
> I am using VBScript to iterate through Exchange mail users
> and access each user's contacts via MAPI using the
[quoted text clipped - 12 lines]
> done differently in Win 2K, I would be very grateful for
> your help.