I just got a wireless mouse M/N M-RAA93, older model, from a friend. He did not have the USB receiver. My question is: I use Windows Vista and looking on Logitech it states that Windows Vista uses its native drivers for the Mouse; Do I need the USB receiver? My laptop has Wireless capabilities, so I am not sure if I can connect without that receiver.
That mouse uses Logitech's 27MHz "FastRF" wireless protocol, so you need a receiver that uses that protocol. It is proprietary to Logitech, so you will need a Logitech receiver (not just your built-in wireless).
Logitech sells some replacement receivers (usually $10 + S/H). Contact Logitech Sales at 800-231-7717 (US and Canada only), see the Contact page for your country.