A Windows executive elaborated on the OS’s monthly security and quality updates in a blog post this week and revealed that some of these are still in the testing phase. There are three types of releases, “B” (“Patch Tuesday” updates), “C,” and “D”; the latter two are releases that “provide visibility into, and enable testing of, non-security fixes.” While “C” and “D” are “optional,” they will reportedly download and install for any user who hits “Check for updates” button. As Chris Hoffman at How-To Geek points out, "at the very least, Microsoft needs to provide a warning before Windows 10 users click the 'Check for updates' button. Don’t warn people in blog posts that only advanced users will read." This option simply shouldn't exist unless users go through a carefully-worded opt-in procedure for these "C" and "D" updates, complete with explicit warnings.