How to enable the Security tab for the organization object in Exchange 2000 and in Exchange 2003

http://support.microsoft.com/kb/264733

Start Registry Editor (Regedt32.exe).
Locate the following key in the registry:
HKEY_CURRENT_USER\Software\Microsoft\Exchange\EXAdmin
On the Edit menu, click Add Value, and then add the following registry value:
Value Name: ShowSecurityPageData Type: REG_DWORDRadix: BinaryValue: 1
Quit Registry Editor.