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After restoring MS 2008 activation is gone

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In DR testing I have found that when doing a bear metal restore of MS Server 2008 that it is necessary to reactivate Windows. Is there a way to prevent this?

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If the metal bea... the machine you restore to the same you backed up, but with a fresh empty disk to simulate BMR? Or is it other machine (=motherboard) ? If the latter, it should ask for activation and there is probably no lawful way to avoid it.

In this case the original is a VM running on Citrix XenServer. Most of our servers are VM's running on Xen or ESX. I am attempting to restore the backup to a newly created VM. This is to simulate the total lose of the original XenServer but actually on the same server. I hope I never have to do this for real but I need to make sure that I can if needed.

In this case it seems that it should ask for activation, because changed MAC address of the network card that is randomly generated for a new VM always triggers activation.

Duh! I'm so used to working with "corp" editions of Windows that I didn't think of that. FYI setting the MAC on the new VM to same as the original does not resolve this issue. It looks like it is something I"m just going to have to live with. Thank you for the input.