I've got an old CF Flightstick Pro joystick with a 15 pin male connector, and I would like to connect it to my PC. The problem is I've only got a 9 pin male seriel port on my mobo, a MSI Neo2.

Also called "DB connectors" and "D-subs," they come in 9, 15, 25, 37 and 50 pin varieties. The D-sub designation defines the physical structure of the connector, not the purpose of each line.