Let's have a recap on the story: This is the first time you would have to pay more to acquire all of Apple's available shares than Microsoft's. There may be interpretations of market cap that still put Microsoft ahead, but as a symbolic moment it's still significant.
Why is it significant? The article proposes the market is betting on the mobile Internet being the future and Apple is much better positioned in this market than Microsoft. This is why Apple's market cap is now in excess of Microsoft's despite Microsoft still posting higher earnings, and hence the P/E observation.
So the whole point is that the two companies are now mostly competing in different markets and this symbolic moment - unheralded by any press releases - indicates the relative directions those two markets are travelling in.