Ivan, why would Intuit support Windows Server 2012 R2 when they released QBDT/E but not now? Pulling support on an operating system mid cycle of a QB version seems unethical in my opinion.  I understand Msoft pulled security updates on Server 2012 R2 but Intuit really needs to follow through and support it for the normal 3 year cycle.  It was working just fine in the February release.  Revert the backend change that was made.