Shares of Apple (NASDAQ:AAPL) woke up on the wrong side of the bed this morning, down by 2% while the broader market was mostly flat. Scanning some early headlines, about the only report that could be feeding the bearish sentiment is one out of everyone's favorite rumor mill, Digitimes.

The infamously hit-or-miss publication says that Apple has reduced its orders of MacBook Pro models from component suppliers since Apple has "high inventory levels" for the ingredients. These tipsters say that shipments to the Mac maker are roughly 20% lower than the company's original estimates. The MacBook Pro is one of the product families that Apple is not facing supply constraints, and Apple's Online Store has all models in stock, including the ones featuring Retina displays. 

It's entirely believable that there may be some weakness in MacBook sales, considering the whole PC market is in a broad decline right now. Recent estimates peg Microsoft (NASDAQ:MSFT) Windows notebook unit sales down 10% over last year, while MacBooks were roughly flat. That doesn't bode well for Windows 8, which Microsoft was hoping would spur a PC upgrade cycle this holiday season.

The Mac has outperformed the broader PC market for more than two dozen consecutive quarters at this point, so 0% growth would still be topping the rest of the PC crowd. Still, the MacBook business continues to decrease in importance relative to overall results, despite its relatively healthy growth compared to the PC market.

Source: SEC filings.

Laptops now comprise just 11% of total trailing-12-month sales. That's half of the 22% contribution the business was just three years ago. That's not to say the MacBook business isn't important at all; just that it's far less relevant than iOS devices. Even if Apple is reducing orders, investors shouldn't be all that concerned.

Fool contributor Evan Niu, CFA, owns shares of Apple. The Motley Fool owns shares of Apple and Microsoft. Motley Fool newsletter services recommend Apple and Microsoft. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.