After applying a Visual Studio Update to your workstation, you may find that the Team Foundation Add-in fails to load. This is the functionality that provides the “Team” tab in Excel within the Ribbon menu, and also lets you export a list of Work Items from Visual Studio into Excel format.
This general behavior is a known issue with Microsoft. The fix is to delete the following key in your Windows registry:
Once the key has been deleted, restart Excel. You should see the “Team” tab appear in the Ribbon again, and you should also be able to easily export Work Item listings from Visual Studio once more.