Windows as a service means less control for IT professionals. Faster upgrade cycles, single rollup patching, and no more service packs.
Aggressive upgrade cycles means that you can no longer deploy a version of windows and stick with it for 5 or 7 years. The upgrade cycle has shortened dramatically to about 18 months. Now feature updates can be deferred but only for a certain amount of time, and never refused entirely.
Windows 10 Pro was released in February 2016, six months later the Anniversary update (version 1607) was released to the Current Branch (CB) and in November 2016 to the Current Branch for Business (CBB). Business versions are able to defer updates for eight months. Therefore, not even a year and a half later in July 2017, you will be forced to upgrade to version 1607 or later.
The version 1607 tightens the group policy timeline down from eight months to 180 days, with a 60 day grace period at the end. It is expected that businesses will have to upgrade each PC in their organization once a year, which can be difficult for those small business without IT staff, since upgrades often break the functionality with third party applications.
It use to be that patches could be selected, rather than with the new upgrade model that rolls all patches into one. This essentially is forcing the PC to the same base configuration as needed for the new rollup. IT professionals can no longer pick and choose, and uninstall problematic updates. The only option is to delay the update a number of weeks until the next rollup. But this also means delaying critical security fixes as well.
No more service packs means that rolling back an OEM device to factory configuration entails getting it to the latest feature update then installing another large update to get it to current.
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