Calendar no longer syncing with iphone after IOS5.

The appointments in Outlook are no longer syncing with my phone after installing IOS5. I've uninstalled/reinstalled iTunes. The itunes add-in in Outlook is disabled and no matter how many times I enable it, it disables. I've reset my phone. I've replaced items on this phone with calendar and nothing seems to work. How do I get my appointments on my phone to be able to sync with iCloud?