Microsoft on Monday joined Logitech and other peripherals makers that offer wireless mice and keyboards for use with Windows PCs. The Redmond, Wash.-based company released the Wireless Desktop, which offers a scroll-wheel mouse and keyboard that connect to a PC without the need for cables. Microsoft offered an earlier version of the wireless mouse, but the keyboard is a new product for the company. The Wireless Desktop combo sells for around $75, and the scroll-wheel mouse is available separately for about $40.