  XMM-Newton observations of 29 high redshift (z>2) quasars, including seven
radio-quiet, 16 radio-loud and six Broad Absorption Line (BAL) objects, are
presented; due to the high redshifts, the rest-frame energy bands extend up to
\~30-70 keV. Over 2-10 keV, the quasars can be well fitted in each case by a
simple power-law, with no strong evidence for iron emission lines. The lack of
iron lines is in agreement both with dilution by the radio jet emission (for
the radio-loud quasars) and the X-ray Baldwin effect. No Compton reflection
humps at higher energies (i.e., above 10 keV in the rest frame) are detected
either. Over the broad-band (0.3-10 keV), approximately half (nine out of 16)
of the radio-loud quasars are intrinsically absorbed, with the values of N_H
generally being 1-2 x 10^22 cm^-2 in the rest frames of the objects. None of
the seven radio-quiet objects shows excess absorption, while four of the six
BAL quasars are absorbed. The radio-loud quasars have flatter continuum slopes
than their radio-quiet counterparts (Gamma_RL ~ 1.55; Gamma_RQ ~ 1.98 over 2-10
keV), while, after modelling the absorption, the underlying photon index for
the six BAL quasars is formally consistent with the non-BAL radio-quiet
objects.
