Corporate pride took a huge hit after they completely wiffed on mobile, then went on to throw good money after bad for a long long time before they were willing to admit that they had lost. Think about where MS could be if they taken google/android seriously at the beginning. For a while, the prevailing opinion was that Microsoft was nearly (or already) no longer a a supermax tech company.

Lots of business orthodoxy got nixed, most prominently the supremacy of Windows over all.