At the Microsoft Inspire conference going on in America at the moment, we have been closely following, Microsoft has just announced it will be offering a package bundling its Office and Windows package into one

https://blogs.office.com/en-us/2017/07/10/introducing-microsoft-365/

They are calling it : Microsoft 365 Enterprise and comes with Office 365, Windows 10 Enterprise, Enterprise Mobility + Security.

It's going to be available in 2 flavours E3 and E5 depending if you would like PBX Functionality or extra security.

Microsoft 365 Business will be available in public preview on August 2, 2017.

Priced at US $20 per user, per month which comes to around 16 GBP

This will greatly simplify Licensing for Users and Business