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Single Hyper-V Server Running Windows Server 2008 R2 with GUI In Place Upgrade to Windows Server 2012 with GUI

The upgrade worked, but there are several things to be aware of before you start:

  1. No one else must be logged on to the computer when you begin the upgrade, except one user a member of local Administrators.
  2. All virtual machines much be in the Off state. Saved virtual machines will be identified as a reason the upgrade cannot proceed.
  3. Do not try an in place upgrade by starting booting from the DVD, you will be told to run from inside the operating system.
  4. You will not lose your virtual machine snapshots, but you are told that once you revert to a snapshot, you lose all the newer snapshots. Effectively, you lose the use of your snapshots, but you don't lose the actual snapshots. You just have to pick the snapshot that you want to start from and then you effectively lose the rest.

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Migrate Hyper-V to Windows Server 2012

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