You forgot Windows 1.x, 2.x, 3.x, 95, PocketPC 200x, mobile 5, 6, 7, 8, RT, NT3.1, 3.5, 4.0, XP, Server 20xx, XP, Vista, 7, 8, 8.1 and finally CE1.x to CE7.x.
Those should be avoided at all times as well if security is the main concern. Have you ever heard of a security breach on a OpenBSD system? You probably did, it's because that is actually newsworthy! News of a new MS security breach is chucked into the same lame bin as 'Cat is stuck in tree', 'Small baby is born', 'MH370 is finally found', 'Cat still stuck', 'MH370 still not found', 'Is this the year for BitCoins'?, "Cat climbed down himself', and other nonsense that will surprise no one at all.
(P.S. This is not meant snarly, cynical or negative, just slightly blasé)