Office 365 is a subscription service becoming the mainstream product 78% of the Forbes 500s have chosen, which can include online access to Office applications plus other cloud productivity services. It’s a evolved application suits businesses of all sizes.
Office Professional Plus as a standalone part of Office 365, has two aspects of its service:

  • First, you can purchase Office Pro Plus via subscription, as a standalone offering or bundled with the E3 and E4 plans for Office 365. Licenses are managed online by indicating which Office 365 subscribers have rights to download and install the bits.  
  • Secondly, the bits you get from the subscription are modified from the volume licensing bits. The Office 365 version automatically verifies licensing and self-activates via the internet.  

For more information about Office Professional Plus