When Windows bug fixes go bad, IT can now roll back individual changes When Windows bug fixes go bad, IT can now roll back individual changes Microsoft has unveiled 'Known Issue Rollback,' which allows IT admins roll back individual non-security elements of an update if the change breaks something Credit: Dreamstime Microsoft has announced a new enterprise-only flexibility in Windows servicing that lets IT professionals roll back individual non-security elements of an update when a change breaks something. The feature, dubbed "Known Issue Rollback," aka KIR, is an unusually frank admission that the company's nearly six-year-long experiment of forcing customers to either accept everything in an update or pass on the update entirely, is flawed.