  Using eight dark matter haloes extracted from fully-self consistent
cosmological N-body simulations, we perform microlensing experiments. A
hypothetical observer is placed at a distance of 8.5 kpc from the centre of the
halo measuring optical depths, event durations and event rates towards the
direction of the Large Magellanic Cloud. We simulate 1600 microlensing
experiments for each halo. Assuming that the whole halo consists of MACHOs, f =
1.0, and a single MACHO mass is m_M = 1.0 Msun, the simulations yield mean
values of tau = 4.7^{+5.0}_{-2.2} 10^{-7} and Gamma = 1.6^{+1.3}_{-0.6} 10^{-6}
events/star/year. We find that triaxiality and substructure can have major
effects on the measured values so that tau and Gamma values of up to three
times the mean can be found. If we fit our values of tau and Gamma to the MACHO
collaboration observations (Alcock et al. 2000), we find f =
0.23^{+0.15}_{-0.13} and m_M = 0.44^{+0.24}_{-0.16}. Five out of the eight
haloes under investigation produce f and m_M values mainly concentrated within
these bounds.
