Unlike other indexes, the Dow Jones Industrial index (DJINDICES:^DJI) is an invite-only club. It includes 30 of the largest U.S. companies, but there are a few kickers that make for an odd index.

First, just because you're large doesn't mean you're included. In fact, the third through ninth largest companies in the U.S. aren't in the Dow.

However, Microsoft (NASDAQ: MSFT) is included in the Dow and is currently vying in a day-to-day battle with Apple to become the world's largest company. But is Microsoft the best stock to buy in the Dow? Let's find out.

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Source Fool.com