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https://synkventures.com/2017/02/13/connect-to-outlook-and-sync-to-outlook-in-sharepoint-task-list-sharepoint-sharepoint2013-we-werent-able-to-start-syncing-your-tasks-because-one-or-more-prerequisites-for-connection-to-exch/
Connect to Outlook and Sync to Outlook in SharePoint Task list #SharePoint #SharePoint2013 (We weren’t able to start syncing your tasks because one or more prerequisites for connection to Exchange server could not be found. Please contact your Administrator to resolve the issue)