1) Click 'Order Reports' under the 'Reports' heading of the 'Control Panel'.

2) Select 'Everything' from the first drop-down menu.

3 & 4) Search for your customer and click the 'Submit' button.

5) Scroll down to see your customer's order history.

Updated
1) Click 'Order Reports' under the 'Reports' heading of the 'Control Panel'.
2) Select 'Everything' from the first drop-down menu.
3 & 4) Search for your customer and click the 'Submit' button.
5) Scroll down to see your customer's order history.