iCloud: iCloud Control Panel 2.0 for Windows requires repair after installation on Windows Vista 64-bit
After installing or upgrading to iCloud Control Panel 2.0 on a Windows Vista 64-bit computer, iCloud is unable to sync with Outlook 2007 or 2010. The Control Panel displays a message that iCloud Mail, Calendars, Reminders, and Notes are available at iCloud.com and prompts you to "Repair the iCloud Control Panel to use iCloud with Outlook." If you follow the provided instructions to repair iCloud, or try to re-install and re-open the iCloud Control Panel to sync with Outlook, the same message appears.
Upgrade to iCloud Control Panel 2.1 or later to resolve this issue.