outlook 2003 error in registry for extension "exchange extensions"

When you open outlook 2003 the error message displayed as error in registry for extension "exchange extensions" then sometimes you have to close error message several times to go to the mail box, you can solve this problem by following these steps.

• Open registry editor
• Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Exchange\Client\Extensions
• In the right side delete the key Exchange Extensions
• Exit registry editor and open outlook
• Your problem will be solved