I have upgraded my magento 126.96.36.199 to 1.7 but when I go to Sales --> Orders, it shows blank, and my lifetime sales and so forth is displayed as 0.
Now iv'e checked the sales_flat_order table, and it is empty. However, The table Sales_Order isn't and has the whole 31827 orders in there. I assume this is the old table used in 188.8.131.52.
So, I am wondering is it possible to take across order history or not ? and if so how can I ensure that it is kept in upgrade?