Microsoft made it clear that Modern would not be applied retroactively to already-existing products or services covered by the 5+5 policy or the alternate, Online Services. The latter applies to such money makers as Office 365.
"The Modern Lifecycle Policy will not be applied to on-premises product versions that have already been released with a different lifecycle policy," the FAQ said.
But while enterprises may be comforted by Microsoft's pledge, it was clear to Miller that the Modern policy was the future. "Going forward, some enterprise-class products will continue [with] 5+5 support," he said. "But there will be another class which is released and serviced on a different cadence. [For that class], support will be at Microsoft's discretion, as defined by Microsoft."
Microsoft did not explain why it instituted the Modern support policy, but Miller had an idea. "They're under pressure to release stuff more often, so they have to have customers on the most recent version," he said, referring to the requirement that users keep updating software.
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