Of course it makes sense for Microsoft to align with Apple (against Google). Apple is not a direct threat to Microsoft. Even before Windows 8 (and Surface), Microsoft made sure they did a cross-licensing agreement with Apple, so that the new MS products would not be targeted for Apple lawsuits. The two companies have already been "playing nice with each other" for the past few years.
And even Microsoft knows that with their new products and OS, they are generally competing against the huge base of Android OEMs and manufacturers (e.g. Samsung, Google-Motorola, etc). Even Microsoft realizes that all those loyal Macintosh and iOS fans are rarely going to defect away from Apple products just to get into the Win8 bandwagon.
Microsoft could care less about the legions of Apple loyalists. MS knows that their best and readily-captured audience are all those fanboys that currently use Google Androids, Samsung phablets, Nexus tablets, users of aging Nokia and Blackberry phones, and an occasional Amazon Kindle user, etc.
I'm not sure I agree with anything else you said, however. Microsoft is doomed? Bah. Microsoft has released disastrous operating systems before (e.g. Vista), and those failures did not kill Microsoft. They are too big and too wide to simply die any time soon.
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And what if in the next couple years Google began seriously getting into Enterprise/Business software? Google has the billions to invest and release enterprise software that could seriously compete with the likes of Microsoft or even Oracle software.
Fortunately for Microsoft, Google is way too stupid to realize that Enterprise/Business software is where Microsoft makes its "easy money". And today, Google is simply stuck in making cheap/free/adware software "for the masses", for the proles (which is what Android is, since it leads to cheaply licensed Android hardware).
Once Google has enough engineers, focus and talent to create enterprise solutions and industrial-strength business software.... then Google can finally put a nail on Microsoft's coffin.
Excellent commentary!
Honestly MS is not in any danger near term of going away (but sensationalized topics to bring out energetic comments).
Still, MS cannot afford missteps like it has in past, the selection of viable alternates is growing in every sector.
It is unmistakable the majority want smaller computers. Laptops replaced desktops as the most popular hardware. Now tablets and smartphone are replacing laptops. Perhaps in future we will have the Smart Glasses and other wearable computers? With hundreds of millions of devices in use, it takes time to adapt, adopt, and switch.
I have a older friend who steadfastly holds on to the dumbphone. Afters it was expense he could not justify. Now he simply does not see the need. My company too is stuck in past. We are upgrading from XP to Win7 when a machine dies (5+ years old).