Office 365 subscription

So Office 2013 year subscription for five (5) computers, instead of a package for a PC.
I was skeptical at first because of the subscription price, but in four years durschnittlicher use of the single package "Microsoft Office Home and Business 2013," for about 400, - EUR (200, - EUR x 2 PCs) will cost up to 25% less ,
But I get the Professional Version, pay annually and have been the next version, while I still have to carry on a / and a half years, the use of two different packages.
Professional (IT) I have the latest Office always dominate because good is not "Open word processor".
The I test as well, but personally I want this moment not allowed.