On the 9th December Microsoft released the Exchange 2010 SP3 Update Rollup 8. The Update Rollup 8 for Exchange Server 2010 SP3 contains the fixes for the security issue that is described inKB2986475.
WARNING – DO NOT INSTALL THIS UPDATE IF YOU DOWNLOADED IT ON THE 9th or 10th DECEMBER!
! Yet again the testing and quality assurance process for Exchange updates has failed !