Works best on Windows 7 and Windows 10 (with Defender disabled).
No. Microsoft discontinued activation servers for Office 2010 via phone and internet in late 2020. Even if you have a genuine product key, you may not be able to activate it. That’s another reason to upgrade or switch to a free alternative.
KMS (Key Management Service) is a legitimate technology used by organizations to activate large numbers of computers on a local network. Tools like "Mini KMS Activator" attempt to emulate this server environment on a single machine to trick the software into thinking it has been legally activated by a corporate server.
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