Since the TZmove.exe looks for the HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionUninstall key. How does it know when the system was patched for windows 2000 machines?

Q: Since the TZmove.exe looks for the HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\ key. How does it know when the system was patched for windows 2000 machines?
A: If a time zone update was performed manually to the system, the Outlook Time Zone Data Update tool cannot detect the update. For example, if you performed the procedure that is described in following Knowledge Base article, neither the command-line options nor the Outlook Time Zone Data Update tool will be able to detect this update.

http://support.microsoft.com/kb/914387/ (How to configure daylight saving time for the United States in 2007)