Noting that T-duality untwists S5 to CP2 S1, we construct the duality chain: n = 4 super Yang-Mills type IIB superstring on AdS5 S5 type IIA superstring on AdS5 CP2 S1 M-theory on AdS5 CP2 T2. This provides another example of supersymmetry without supersymmetry: on AdS5 CP2 S1, type IIA supergravity has SU(3) U(1) U(1) U(1) and N = 0 supersymmetry but type IIA string theory has SO(6) and N = 8. The missing superpartners are provided by stringy winding modes. We also discuss IIB compactifications to AdS5 with N = 4, N = 2 and N = 0. 1998 Elsevier Science B.V.