A family of Microsoft relational database management systems designed for ease of use.
I'm glad you got on top of it in your situation but reinstalling Windows on many workstations and then disabling Windows updates isn't my idea of a fix in my situation.
I'm not holding my breath but MS should be all over this and be producing a proper fix ASAP.
I'll know within a few hours if disabling leasing has worked and will report back here.