France has a history of genuinely favouring open source. By and large this has helped keep the French IT sector active and helped avoid some outsourcing.
Office 2016 will now ask you what format (OOXML / ODF) you want to use as standard. I spend a fair amount of time working my way through the OOXML specification and there are some maddening inconsistencies and errors in it. I can very much imagine many of the Microsoft developers jumping for joy they no longer have to work with it themselves. ODF is a far better specification though by no means perfect.
To their credit Microsoft has continued to publish the details of what are essentially proprietary extensions to OOXML and the extensions are generally a considerable improvement on the original, which looks like decompiled BIFF mixed in XML bullshit a lot of the time. Office 2013 will even let you save as "strict OOXML" with the disadvantage of this being the least interoperable version, largely because it uses different XML namespaces. The last time I checked it wasn't supported by LibreOffice or OpenOffice but that may have changed.
The big problem for LibreOffice and OpenOffice, and the opportunity for Microsoft, is that LO and OO are worse to use. I gave up on LO because it routinely crashed doing things like saving to PDF or loading a single page invoice with an embedded logo. OO is more stable and has the better UI but is getting little developer love. Microsoft has the money to pay developers and you can see this in the upcoming Office 2016 which has toned down the worst of the 2007 / 2010 distractions (I hate the ribbon) and particularly Excel has features which "power users", generally in the finance industry, are happy to pay for.
Microsoft has also, if somewhat belatedly, discovered the mobile market where OO and LO have yet to show. For things to really change then we're going to have work out ways of paying more developers to work on OO and LO (merging codebases at some point might be an idea).
Last but not least, I'll side with almost anyone agains the time-wasters at the FSF.