  We present submillimeter observations of SO, SO2, H2S, H2CS, OCS,
  NS and HCS+ toward nine massive young stars. The outflow contributes ~50% to
the SO and SO2 emission in 15-20'' beams, more than for CS, where it is 10%.
The SO2 abundance increases from dark cloud levels in the outer envelope (T<100
K) to levels seen in hot cores and shocks in the inner envelope (T>100 K).
Molecular abundances are consistent with a model of ice evaporation in an
envelope with gradients in temperature and density for a chemical age of ~30000
yr. The high observed abundance of OCS, the fact that T_ex (OCS) >> T_ex (H2S),
and the data on solid OCS and H2S all suggest that the major sulphur carrier in
grain mantles is OCS rather than H2S. For most other sulphur-bearing molecules,
the source-to-source abundance variations by factors of up to 10 do not
correlate with previously established evolutionary trends in temperature
tracers. These species probe the chemically inactive outer envelope. Our data
set does not constrain the abundances of H2S and SO in the inner envelope,
which, together with SO2, are required to use sulphur as a clock.
