Story highlights Microsoft CEO Steve Ballmer announced Friday that he will step down in the next 12 months

Under Ballmer's reign, Microsoft has had a mixed record of success with its products

The Xbox console has been a consistent seller, while the now-defunct Zune music player was a dud

Poor Steve Ballmer. The burly Microsoft CEO, who announced Friday that he will retire next year , has been the victim of some unfortunate timing.

When he took over leadership of Microsoft in 2000 Ballmer had to follow iconic co-founder Bill Gates, who had built the software titan into the most valuable company in the world. Then Ballmer was blindsided by the swift rise of Steve Jobs and Apple, whose iPod, iPhone and iPad led a mobile revolution and made Microsoft appear slow and out of touch.

On a more positive note, Ballmer has been credited more recently for re-imagining the company's core product with the bold Windows 8 operating system and leading a 2013 revival of Microsoft's once-flagging stock.

Under his reign, Microsoft has a mixed record of success with its consumer products. Here's a look at some of the company's more notable hits and misses of the Ballmer era.

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Hits

Xbox -- Launched in 2001, the venerable video gaming console and its successor, the Xbox 360, have sold more than 100 million units. Some blockbuster games, such as the "Halo" and "Gears of War" series, are available only for the Xbox. Its Kinect system was hailed as a step forward in motion-control gaming, while Xbox Live, Microsoft's online multiplayer gaming network, now has more than 46 million members worldwide. Microsoft will release its next-generation console, the Xbox One, in November.

Microsoft says a new upgrade will turn the Xbox 360 into a hub for all television viewing.

Bing -- Ballmer in 2009 introduced Microsoft's Bing search engine, which drew praise for its attractive visuals and predictive-text features that produced search suggestions before users were done typing queries. It won't challenge Google's dominance any time soon, but Bing has emerged as a credible rival. It has gradually increased in popularity and -- Ballmer in 2009 introduced Microsoft's Bing search engine, which drew praise for its attractive visuals and predictive-text features that produced search suggestions before users were done typing queries. It won't challenge Google's dominance any time soon, but Bing has emerged as a credible rival. It has gradually increased in popularity and now commands almost 18% of the U.S. search engine market.

Windows Phone 7 (and 7.5) -- With this launch in late 2010 and early 2011, Microsoft completely rebuilt its mobile operating system from the ground up by adding a more intuitive interface, better social-networking tools and a high-def screen with colorful "live tiles." It was a radical move for a company that for years had been playing it safe.

Misses

Internet Explorer 6 -- This version of Microsoft's widely used desktop browser was roundly criticized for its security flaws and lack of support for modern Web standards.

Zune -- In 2006, Microsoft finally launched its answer to Apple's hot-selling iPod. But the clunky Zune line of portable media players never caught on, and by late 2009 their market share had dropped to 2%. It didn't help that at midnight on December 31, 2008, all of Zune's 30GB models froze up for a day -- a problem with the way the device's internal clock recognized (or didn't recognize) leap years. Microsoft put the Zune out of its misery in 2011.

Vista -- Released in 2007, this successor to Windows XP was an immediate dud. Critics complained about its cost, sluggish speed, restrictive licensing terms and how Vista aimed to discourage the copying of protected digital media. One survey of corporate users found -- Released in 2007, this successor to Windows XP was an immediate dud. Critics complained about its cost, sluggish speed, restrictive licensing terms and how Vista aimed to discourage the copying of protected digital media. One survey of corporate users found only 8% said they were "very satisfied " with the operating system. Stung by the reaction, Microsoft rushed out Windows 7 less than three years later.

Surface tablets -- Again, Microsoft found itself chasing Apple, this time with a belated attempt to dethrone the market-leading iPad. Launched in October 2012 -- more than two years after the original iPad -- the Surface tablet was Microsoft's first attempt to integrate its new Windows 8 operating system with its own hardware.

The Microsoft Surface, running Windows 8.