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Enterprises that have adopted Windows 10 will face the demise of three versions of the operating system in the next 18 months, and so for the first time will be forced to keep up with the faster release and retirement cadence Microsoft has embraced.
In March, Microsoft will end support for Windows 10's debut version, the build launched in July 2015. While the version -- designated 1507 in the company's year and month nomenclature -- will continue to work, security updates will cease, probably after Microsoft delivers the month's Patch Tuesday fixes on March 14, 2017.
After that date, devices assigned to what Microsoft calls "Current Branch for Business" (CBB) -- the release track that most commercial PCs have been assigned to -- must be updated to a build newer than 1507 to continue receiving vulnerability fixes.