As gotham states Microsoft and Apple have done several major projects together, particularly back before the G3 days when Apple was in deep mire, even to the point of investing very heavily in the company with loans.
Gotham didn't really state that, and your statement is patently and provably untrue.
MS has never loaned Apple money. Ever.
MS bought some Apple stock, then sold it at a profit some years later. MS signed a cross-patent license agreement with Apple and paid them an undisclosed sum to settle a lawsuit Apple was clearly going to win.
This is all explained in more detail in Apple Confidential 2.0 by Owen Linzmayar, which is available to read online.
The truth about MS and Apple -- and the truth about Google and Apple -- is more complex than the emotional states of two six-years-olds (I like you! You're my BFF! Oh wait, now I hate you! IT'S WAR!!!).
Like with MS, Google competes with Apple in some ways and works with them in some ways. In those areas were Apple and MS or Apple and Google compete, Apple is a fierce (and largely successful) competitor. In the areas where they cooperate, the result is usually some great stuff for the end user.
I don't think Apple would have any problem *at all* with signing a deal with Bing to make it the default search in the future. You may recall that Apple had IE as its default browser for YEARS in the early days of OS X. That doesn't mean Apple wouldn't still riff on "copycat Redmond" regarding their POS OS, or promote iWork at the expense of Office.
Nor would Apple have a problem continuing to use Google for searches or maps, no matter how they may feel about Android. They could simply be moving to offer more choice in this regard, or gain more independence on which suppliers they want to use, which would surely be good for users.
The media tends to whip this nonsense up into "fights" and "wars" that don't really exist. If you believe Apple and Google hate each other, you probably believe that Apple and Apple Corps still hate each other. Corporations aren't people. They are far more pragmatic and a lot less emotional when it comes to business relationships than humans tend to be about personal relationships. Thus, it's a mistake to assign human attributes to corporate relationships (especially the completely immature attributes generally attributed to Apple "versus" Google).