Microsoft's naming scheme is so hopelessly mangled I've kind of given up on ever understanding it again.
Windows paradigm shifting every release was bad enough: 98, ME, XP, Vista, 7.
Then you've got X-Box, X-Box 360 (presumably a reference to a 360 degree turn...why would I want to be back where I started?), and X-Box One.
Now after the last relatively sane numbering system was in Office ('97/XP, 2000, 2003, 2005, 2007, 2010, 2012...), they've decided to kill that with "Office 365"? Way too close in numbering to 360...and this is supposed to be a reference to 365 days in a year? I can use previous copies of Office every fucking day of the year without a subscription!! DO NOT WANT.
Although that last is a kind of moot argument as I've been using Open/LibreOffice ever since 2007 and The Ribbon. I still regret spending $79 on that (with the CS degree discount).