Customer List
On June 12, 2012 we will be removing the Customer List from your QuickBooks Online service since we’ve replaced it with the Customer Center, which has all of your saved data from the Customer List. We've had the shiny new Customer Center out in market for over a year and we're hearing fantastic feedback on it. Therefore, we feel confident that the Customer Center will serve all of your needs even better than the old Customer List.
If you have any questions about how to use the Customer Center, or about all the great things you can do on the page, check out this helpful article on Using Customer Center: support.qbo.intuit.com/support/answers.cfm