Microsoft 's value is returning to tech-bubble peaks.

The software giant closed with a market value of $600 billion Thursday for the first time since January 2000, according to the Journal's Market Data Group. Shares rose 0.4% to $77.91, setting a fresh all-time high. For the year, Microsoft shares are up 25% and on track for their best year since 2013, as the firm continues its rebirth as a force in cloud-computing.

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