Author: Jeremy_MSFT Originally published to the Office 365 Preview blog. Office 365 ProPlus activation is tied to the users provisioned your organization’s Office 365 tenant. When a user signs in for the first time after product installation, Office 365 ProPlus requests the user to sign in one time activate the installation. Activation Sign In screen Because the Office 365 service handles the activation, there are no product keys to add into your deployment procedures and Key Management Services (KMS) are unnecessary. Activation status can be managed by the Office 365 administrator in order to add or remove users. Changes to the user accounts and activation status are designed to appear at the clients as applications are launched. Apps will automatically look at account status information and if a user has been deprovisioned – the user will be informed that there are no Office licenses assigned to his user account and close the application. Notification window stating that there are no Office licenses available to the user This solves for a key consumerization of IT challenge when users bring in their own devices and expect software to be loaded on otherwise personal devices. With in-house line-of-business applications, the applications can check for access to internal files and respond accordingly. Third party applications – like Office in this case – are more difficult to de-activate, as they tend to have a perpetual activation without any ties to your organization. In the consumerization of IT scenario, you are essentially leasing the software to users while they are employed by your organization. With Office 365, termination of employment along with subsequent service deprovisioning will allow you to de-activate Office installs allocated to that user on his or her personal devices. In cases where the user is offline without access to the Internet, Office 365 ProPlus will remain in an activated state for up to 30 days without Internet connectivity. If the desktop applications go into a de-activated mode due to non-use, applications can be re-activated connecting to the Internet and the Office 365 service. Office 365 ProPlus is built to make the activation and de-activation process easy and manageable, but people using Office 365 ProPlus are anticipated to connect to the Internet frequently to ensure uninterupted service. In cases where computers are always completely offline or only operated within a corporate firewall, Office Professional Plus 2013 is an excellent option. For more in-depth information about Office 365 ProPlus activation, check out the Overview of licensing and activation in Office 365 ProPlus Preview on TechNet.