What is the Add-Ins tab on the ribbon used for?

The Add-Ins tab is for the commands that were available as an add-in in Microsoft Office 2007 and earlier. You cannot add, remove, or change the order of the commands on the Add-Ins tab.

Applies to:
Access 2010, Excel 2010, InfoPath 2010, OneNote 2010, Outlook 2010, PowerPoint 2010, Project 2010, Publisher 2010, SharePoint Designer 2010, Visio 2010, Word 2010