Windows 10: Can I use Outlook for Calendars and Contacts vs. the native apps?

Before I installed Windows 10, I was using Outlook for my calendars and contacts, sync automatically with iCloud. I like the functionality of Outlook for my everyday tasks.

After I installed Windows 10, my calendar and contacts only appear in the native app, and I am "unable to open (iCloud) folders" in Outlook. When I check the settings in iCloud control panel, it is set to sync with Outlook.

How can I get my calendars and contacts from iCloud to sync into Outlook (or at least sync Outlook with native apps)?

Try uninstalling and re-installing iCloud app. That fixed other problems for me and your problem for others.