Office 2010 will now use Key Management Service (KMS) to activate your product, further simplifying the installation process of Office 2010. KMS eliminates the need to manually enter license codes ...

Systems activated using KMS must reactivate at least once every ... a request for additional information and comment on its Office 2007 activation program.

By default, KMS activations are valid for 180 days ... e.g., Windows, should automatically re-activate, and your Office products will activate if you launch the application while connected to the VPN.