Uncertainties in the MS bottom quark mass from relativistic sum rules

A detailed compilation of uncertainties in the MS bottom quark mass m̄b(m̄b) obtained from low-n spectral sum rules at order αs2 is given including charm mass effects and secondary bb̄ production. The experimental continuum region above 11.1 GeV is treated conservatively. An inconsistency of the PDG averages for the electronic partial widths of ϒ(4S) and ϒ(5S) is pointed out. From our analysis we obtain m̄b(m̄b)=4.20±0.09 GeV. The impact of future CLEO data is discussed.