Open your "My Site" site. On left navigation, select My Tasks.
TODO: Specify the steps
After a while of searching we could found that Integration between SharePoint Server and Exchange Server can only be disabled on-premises who will resolve our issue. To disable it, you turn off the
Farm Level Exchange Task Sync feature by going to Central Administration è
Manage farm features. This action deletes the timer job and disables the UI integration, bringing back the legacy sync behavior to Outlook.
When a user navigates to the SharePoint’s My Task page, that user can find the Sync to Outlook button in the Tasks pane of the ribbon.
After clicking that button, the opt-in dialog box is shown. Select the Sync tasks check box to opt in.
When try to synchronize My Tasks with Outlook 2010 or 2013 you get the following error:
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.