If you are having trouble customizing outlook today, try this. This is the result of a security update to IE, but it disables Customization of Outlook Today.

1. Quit Outlook 2000
2. Modify registry key HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Application Compatibility by adding DWORD value Outlook.exe and give it a value of 1
3. Make changes to Outlook Today.
4. Reset above to 0 or remove Registry key