Microsoft has announced its new lightweight wireless mouse, the Wireless Mobile Mouse 1850. Priced at less than $15, the 1850 uses 2.4GHz wireless technology for a reliable computer connection, and holds a built-in mini USB transceiver that can be plugged into one’s computer or hidden inside the mouse. The mouse will be offered in black, red, pink, purple and dark blue, and is due to be available this month….