We report resistivity, magnetization and upper critical field B-c2(T) data for arsenic dificient LaO0.9F0.1FeAs1-delta in a wide temperature and high field range up to 60 T. These disordered samples exhibit a slightly enhanced transition temperature of T-c = 29.0 K and a significanly enlarged slope dB(c2)/dT = -5.4 T/K near T-c. The high B-c2(T) data obtained from resistance measurements in pulsed magnetic fields follow up to about 30 T the WHH (Werthamer-Helfand-Hohenberg) curve for the orbital limited upper critical field, but show a clear flattening above 30 T. This flattening evidences Pauli limiting behaviour (PLB) with B-c2(0) approximate to 63 T. We compare our results with B-c2(T) data reported in the literature for clean and disordered samples. Whereas clean samples show no PLB for fields below 70 T as measured so far, the hitherto unexplained flattening of B-c2(T) for applied fields H parallel to ab observed for several disordered closely related systems is interpreted as a manifestation of PLB. The influence of the arsenic vacancies in LaO0.9F0.1FeAs1-delta on the vortex matter phase diagram is studied by magnetization measurements on bulk samples.