This evening (Tuesday, May 14th, 2019), we will be pushing out some Windows 7 related emergency patches that were released today. They address a critical vulnerability. Most CAT supported Windows 7 desktops will reboot at 2am (early Wednesday morning) to install the patches.
Windows 10 desktops are not affected by the actions of tonight. (Although our regular Windows updates affecting Windows desktops in general will happen later this week.)