  35 years after its synthesis magnetic observables are calculated for the
first time for the molecular nanomagnet Mn12-acetate using a spin-Hamiltonian
that contains all spins. Starting from a very advanced DFT parameterization
[Phys. Rev. B 89, 214422] we evaluate magnetization and specific heat for this
anisotropic system of 12 manganese ions with a staggering Hilbert space
dimension of 100,000,000 using the Finite-Temperature Lanczos Method.
