Apple has released iCloud for Windows 5 with support for iCloud Photo Library and two-factor authentication for Apple ID accounts. Windows users were previously limited to accessing iCloud Photo Library through the web interface.
Apple recommends that iCloud for Windows users have Windows 7, 8 or 10 installed. For email, the software currently supports Outlook 2007 through Outlook 2013, while Outlook 2016 users can access iCloud Mail, Contacts, and Calendars on iCloud.com.
Use iCloud Photo Library on your Windows PC to download all of the photos and videos from your Apple devices to your computer, or upload your Windows Pictures library to iCloud. And when you turn on iCloud Photo Sharing, you can share your captured memories with just the people you choose.
Apple has published a support document for setting up and using iCloud Photo Library on Windows.