My company just upgraded from SBS 2000, to Server 2003, and we have an issue
with getting Outlook '03 to run on the user end, without admin rights.
1. Have installed Office 2003 as administrator on the local machine.
2. Have logged in as a domain administrator (user x)and performed the
initial setup of mail accounts etc as this temporary priviledged user, then
logged off from Windows.
3. Have removed this user (user x) from the domain admin list and then
logged back in to Windows and try and start Outlook 2003 and receive the
"Access is denied" error message.
No error number or further information is presented in the dialogue box
(apart from the OK button).
Have tried the same thing by adding and removing admin rights for the user
on the local machine instead of the server.
Same result.

The only thing that seems to fix it is giving the user(s) admin rights on
the domain or the local machine, neither of which is a viable option for us
considering the risk of having 200 admins in our network.
And everything else seems to function well.