TF208103: The initialization of the workbook to connect to Team Foundation Server was not successful. The workbook will close. ...

TF208103: The initialization of the workbook to connect to Team Foundation Server was not successful. The workbook will close. You can try to connect again by re-opening the workbook.

If repeated attempts fail to initialize the workbook and you need to work with the data in the workbook, then you should disable the Team Foundation add-in. For new or other workbooks with lists bound to Team Foundation Server, you will need to re-enable the Team Foundation add-in.