Updating from windows 2016 to xp
Extended support for Windows Embedded POSReady 2009—the last supported version of Windows based on Windows XP—ended on April 9, 2019, marking the final end of the Windows NT 5.1 product line after 17 years, 7 months, and 16 days.Counting this edition, Windows XP is the longest-lived version of Windows ever—a record that is unlikely to be beaten.But that hasn’t stopped these companies from relying on the software.We all know that the OS is still in use, if for no other reason than discovering a family tech-support emergency in which we are asked to fix a relative’s old computer.
Windows Embedded for Point of Service SP3 and XP Embedded SP3 reached end-of-life in 2016, while support for Windows XP Home and Professional SP3 ended five years ago, on April 8, 2014.
Of note, Windows Update will require SHA-2 encryption support as of July 16, 2019 to continue receiving updates.
It's probably a safe bet that Windows Update will continue to work normally until then, though guarantees are impossible.
If your systems are not connected to the Internet, it is possible to continue operating an out-of-support of system, though it's important to be wary about any devices—particularly USB drives—connected to the system.
It's unclear when Windows Update services for POSReady 2009 will be deactivated, if ever—minor issues such as expired certificates could impede the ability to install updates, though Windows 2000 could still connect to Windows Update as late as 2015, with some effort.