There are mixed signals on Wall Street these days, causing market watchers to debate the state of the current rebound. Yet from a historical perspective, every bear market has been followed by an even stronger bull market -- and there's evidence that suggests that one may have started already.

The S 500 has already notched gains of more than 20% since the bear market trough in October, which is one sign of an impending bull market. Once the index reaches new heights -- just 9% higher than where it stands today -- any lingering questions of whether we're in a bull market will be put to rest.

Furthermore, while some companies were stopped dead in their tracks by the worst downturn in more than a decade, others proved their mettle by continuing to notch impressive growth. One such unstoppable stock was (NASDAQ: MSFT), and despite its 39% gains so far this year, the evidence suggests the company's best days are yet to come.

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Source Fool.com