Export and import VM from Hyper-V Manager. Host running Hyper-V server 2012R2. Hyper-V Manager running on 2012R2.
Does not work :( Source and copy have identical SID. The ‘GenerateNewId’ parameter does not change this. You avoid running all these updates again, but no way of getting round not sysprepping the imported vm. Damn.
Running a Server 2012R2 Hyper-V Server. Exported a VM and absolutely 100% failed to import the exported VM again. Looks like running a Hyper-V manager from Windows 10 is a bad place to be. So install a fresh 2012R2 - only for running the manager. Exported from a Hyper-V manager installed on a 2012R2, from a host running 2012R2 Hyper-V Server. What could go wrong with this? Export is running fine (again), and export format is version 8 again. So Hyper-V Manager is exporting a format it cannot import. That is ... beyond strange. So MS is thinking something like: Export, update host OS and then import. As the Eurovision judges from Belarus say, “nil point” (stole that quote).2016 should be able to import version 8 VMs, but have to try.
In short: Export from Hyper-V Manager and import with Powershell Import-VM cmdlet.