Why is that a problem?
With Linux they can acquire a stable new Windows 9, tested and proven.
Apple has made no effort to integrate anything on the Mac - you have to use their own "scripting language" for that. So "Libre Office" / "NeoOffice" is in many ways better integrated with "Mail" than "Pages". Btw: Mail sucks, are miles behind Thunderbird and Outlook thanks to Steve Jobs and arrogant *****.
MS has never made a real OS after MS-DOS and Windows 3.1 - after that they are all acquisitions or "consulting jobs" by external contractors. Steve Ballmer loves freebies - so Windows 9 may well be a Linux distro. (That will kill the network "anti-virus scanner" business should that give rise to concern.).
