Just updated to 4.1.2.3 but cannot get View - Data sources menu. Help please

I want to access an existing data source of addresses, to print labels, but cannot get View - Data Source menu.

I must be missing something.

I found the answer. Base was not installed at the upgrade - now I have installed it Data Sources is available in the View menu. Now I just need to find my original table - buried somewhere in my system!