?? Seriously: It doesn't make any sense at all.
1.) Apple doesn't consider the work of Microsoft as very valuable to their own plans. Sure, they're glad MS still makes Office for the Mac, but none of MS' projects could be considered key to Apple's future.
2.) Microsoft was allowed to go on in the 90s partly because there _was_ competition in the OS market as well.
3.) Being larger in market value doesn't in any way mean you need to buy the company that previously was larger. There's no cause and effect here. No logical link.
4.) Apple's not continuing to lose market share. It's currently gaining in home, business and education.
Mac user since 1987. Running Mac OS X 10.8 Mountain Lion on a MacBook Air 11" & an iMac 27" and whatever's newest for my iPhone 4s, iPad 3 and AppleTV 2.
Apple Certified System Administrator 10.6, Apple Sales Professional 2008-2011, Apple Certified Mac Technician.