I've been having trouble with the iCloud Control Panel for Windows for some time. iCloud works great on my iOS devices and Mac, but on my work computer, the Photo Stream has never worked reliably. I just upgraded to version 4.0 in hopes that this would resolve the Photo Stream problem and instead lost the ability to sync with Outlook 2013 (on Windows 7).
My IT department had just deployed Outlook 2013 and had left Outlook 2010 installed. While iCloud had been working just fine with Outlook 2013, after upgrading to 4.0, it complained about the double install of Outlook. I called IT and asked them to uninstall 2010 (I don't have administrative privileges on the computer, sadly). After they did, instead of the Mail/Contact/Calendar sync option reappearing in the iCloud control panel, it now has just the other options and a message that says "You can access Mail, Contacts, Calendar and Reminders at iCloud.com." The Outlook add-in is active for iCloud (though I can't see its toolbar icons), but my calendar and contacts no longer sync.
I've had IT reinstall the iCloud control panel to no avail. Does anyone have any suggestions on what I could try (especially if they don't require administrative privileges)?