Microsoft’s KB 4458166, released on Tuesday, explains that the push to Win10 version 1803 has been halted for machines running .Net applications that use the TLS 1.2 security protocol. Presumably, effective Tuesday, if you have a Win10 1709 or 1703 machine that’s running one of those programs (including, notably, QuickBooks Desktop), Microsoft won’t try to push 1803 on it.
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