Did you know you can remove the Departments menu from the navigation pane? You may want to do this as you customize the RoleTailored experience for yourself or your customers. The ease of doing this has been improved beginning with Microsoft Dynamics NAV 2009 SP1 and also applies to Microsoft Dynamics NAV 2009 R2.
1. On the menu bar, click Customize 
, and then click Customize Navigation Pane.
2. In the Customize Navigation Pane window, in the Navigation pane buttons list, click Departments and then click Remove. You can also remove other buttons, such as Administration. You cannot remove the Home button.
3. Click OK.
4. Select Yes to restart the RoleTailored client and see your changes.