if like me, you use TFS and Excel to manage your WorkItems, and maybe your TEAM tab is removed every time Excel is opened. To solve this :
1. Check if this Registry key is on 3 (autostart).
2. Enable TFS plugin in Excel :
– Go to File / Options / Add-ins
– in the bottom of screen, select Manage COM Add-ins, and click on the GO button.
– Check Team Foundation Ass-in and click on OK button confirm.
That’s all 😉