In all Office 2010 applications the File Ribbon is fully customizable. In order to customize your Ribbon within Outlook for to File > Options > Customize Ribbon
Figure 1: Outlook options
First we will create a new Ribbon Group that will show up on the Home ribbon. Click the New Group button.
Figure 2: Customize Ribbon
Title the group an appropriate name.
Figure 3: Select icon and name
Now from within the Ribbon customization window select the Actions you wish to have included in your new Ribbon Group.
Figure 4: Select commands - actions
For this Example we have added Close All Items to appear within out new program group.
The new program group along with the actions selected will now appear on the Ribbon.
Figure 5: New Program