  A recently developed method for incorporating initial binary correlations
into the Kadanoff-Baym equations (KBE) is used to derive a generalized T-matrix
approximation for the self-energies. It is shown that the T-matrix obtains
additional contributions arising from initial correlations. Using these results
and taking the time-diagonal limit of the KBE, a generalized quantum kinetic
equation in binary collision approximation is derived. This equation is a
far-reaching generalization of Boltzmann-type kinetic equations: it
selfconsistently includes memory effects (retardation, off-shell T-matrices) as
well as many-particle effects (damping, in-medium T-Matrices) and
spin-statistics effects (Pauli-blocking).
