Notes: Activating a KMS key against a Key Management Server probably still works, as I interpret above tweet right. So there, too, activation seems to be denied by Microsoft. Tobias answered that he uses a volume license with a multi-activation key (MAK) for his Microsoft Office 2010. German blog reader Karl says in the following reply tweet: No longer works. The German tweet above says, he could not activate Microsoft Office Professional Plus 2010, either online nor via telephone activation. German blog reader Tobias has now had the unpleasant experience that this required activation no longer works – neither the online activation, nor a telephone activation, as he shares on Twitter. The company has simply switched off the activation servers that are required for Office 2010 activation. Unfortunately, some users who bought Microsoft Office 2010, haven't calced without Microsoft.

Should be no problem for a regular buyer who owns a key. To be able to use Microsoft Office 2010 after a new installation, it must be activated by Microsoft. Microsoft Office 2010 needs to be activated