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I downloaded the tasks app and have everything synced well. I can create a task in the wp8 application fine, and it will sync with the exchange server and publish to my other devices (portal and outlook). I can also create, and complete tasks in the office365 portal and outlook and have it synchronize completely to all devices; however I am unable to complete tasks in wp8 and have them sync. Once I complete the task in wp8 it shows it as completed on the phone but the portal and outlook show it as incomplete, even after several syncs this doesn't change.