Office 365 ProPlus is one of the subscription service plans in the new Office. It is productivity software (including Word, PowerPoint, Excel, Outlook, OneNote, Publisher, Access, Skype for Business) that is installed on your desktop or laptop computer. Office 365 ProPlus is a user-based service that allows people to access Office experiences on up to 5 PCs or Macs and on their mobile devices. Traditional Office installations were tied to the computers they were installed on. Office 365 ProPlus enables flexible new deployment options that IT and/or individual users can choose from to install Office.
Annual commitment refers to the length of time the service agreement lasts.