Sometimes it happens that because of a crash or unknown issue the Team Tab in Excel disappears. Usually you will notice this, because
you get an error when you try to open a excel sheet with TFS data.
The reason is that this Add-In is disabled. To make it appear again do the following
- Start Up Excel
- Click the office Button and choose “Excel Options” totally at the bottom
- Click Add Ins, Choose Com Add-ins from combobox and click Go
- Check Team Foundation Add In and click OK
- Restart Excel