  We present initial XMM-Newton EPIC observations of the prototypical starburst
galaxy M82. The superwind is seen to extend continuously from the starburst
region to the X-ray emission associated with the Halpha 'cap'. We also find
evidence for a ridge feature, probably associated with the superwind
interacting with an HI streamer. Narrow band images, centred on individual
X-ray lines, show differences in morphology, with higher energy lines being
less spatially extended, and a systematic shift with energy in the region of
peak emission. Spectral fits with two thermal and one power-law component
provide a good fit to the spectra of the nuclear and inner wind regions,
indicating a multiphase superwind. We discuss the implications of these
observations on our understanding of superwinds.
