Office 365 is a plan or feature

In the below link, office 365 proplus is mentioned as one of the plans.

http://products.office.com/en-IN/business/office-365-proplus-business-software

But in some links, it was mentioned as local install-able version.

https://technet.microsoft.com/en-us/library/gg702619.aspx

So confused about this, whether it is a plan or a feature in plan.

Could you anyone please clarify this.

Thanks and Regards, Uday Kiran Reddy Project Engineer Technology Infrastructure Services, Wipro Technologies ____________________________________________ Mob: +91-900-061-2578 | Email: uday1kiran@live.in