(NASDAQ: MSFT) should be a sure-fire Warren Buffett stock. It has a wide moat, excellent fundamentals, and investors have come to expect a great deal of consistency from the business over the years. It's the type of investment you would expect to see in the billionaire investor's portfolio.

But despite all these reasons, it's still not a Berkshire Hathaway holding. Here's a closer look at why that is.

Buffett likes to invest in companies that he knows well. But unlike insurance and banking, technology is not something that he's all that comfortable investing in, simply due to the unpredictability of it. He says the reason he didn't invest in Microsoft years ago was simply due to "stupidity." 

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Source Fool.com