Exchange 2k OWA only allows Admin Access

I installed a 2000 server for a small 10 user network. It runs AD, exchange 2k sp3, on windows 2000 sp3. Only Domain Admins are able to successfully login to Outlook Web Access. All other users are rejected. I have tried:

1. Under Local Policy and the Default Domain Controller Policy I gave Domain Users “log on locally” rights.

2. I gave the everyone group, domain users, and IUSR_MachineName full control over the exchweb folder, propogating permission thruout all subfolders.

Still only Domain Admins can access web outlook.

Any suggestions?