  The all-sky surveys in gamma-rays by the imaging Compton telescope (COMPTEL)
and the Energetic Gamma Ray Experiment Telescope (EGRET) on board the Compton
Gamma Ray Observatory for the first time allows detailed studies of the
extragalactic diffuse emission at gamma-ray energies greater 1 MeV. A
preliminary analysis of COMPTEL data indicates a significant decrease in the
level of the derived cosmic diffuse emission from previous estimates in the
1-30 MeV range, with no evidence for an MeV-excess, at least not at the levels
claimed previously. The 1-30 MeV flux measurements are compatible with
power-law extrapolation from lower and higher energies. These new results
indicate that the possible contributions to the extragalactic emission from
processes that could explain the MeV-excess, such as matter-antimatter
annihilation, is significantly reduced. At high energies ($>$ 30 MeV), the
extragalactic emission is well described by a power law photon spectrum with an
index of -(2.10+-0.03) in the 30 MeV to 100 GeV energy range. No large scale
spatial anisotropy or changes in the energy spectrum are observed in the
deduced extragalactic emission. The most likely explanation for the origin of
this extragalactic gamma-ray emission above 10 MeV, is that it arises primarily
from unresolved gamma-ray-emitting blazars. The extension of the power law
spectrum to 100 GeV implies the average emission from gamma-ray blazars may
extend to 100 GeV.
