said by JohnInSJ:
Yep, $100 a year for 5 licenses of Office that would cost you $400 a year to buy, per license, if you got the same suite shrink-wrapped as office2013. So, in 20 years you'd break even on just buying 5 copies outright.
Not only that but as I use OneNote, excel and PowerPoint so I split the cost with 3 coworkers. Only costed me $35.