User can choose to rearm Office to reset the grace period back to 30 days when the current grace period almost runs out, or activate the Office system via KMS or MAK. A default generic KMS client volume license key (GVLK) will be automatically installed, which grant 30 days activation free usage period. Similar to Office 2010 volume license (VL) edition, Office 15 M2 does not require a product key during installation. As the result, Office 15 M2 can also be activated with hack which uses one of many KMS-based activators which available for Office 2010.

And the Office 15 M2 distribution channel belongs to OfficeMondoVL_KMS_Client1 edition of volume licensing channel, which requires activation through a KMS (Key Management Service) or MAK (Multiple Activation Key).

1000 activation mechanism has not been undergoing major overhaul or change, yet, when comparing with Office 2010. The leaked Office 15 (2012 or 2014) M2 build version.