Steve Jobs resigned as CEO of Apple on Wednesday and passed the reins to his right hand man Tim Cook 2011

The letter and a separate terse, somewhat cryptic statement from Apple raised more questions than it answered about Jobs' health and the future of the company.

While it's unlikely that his departure as CEO will derail Apple's ambitious product-launch roadmap in the near term, there are concerns about whether the company would be as creative beyond the next year or so without its founder and visionary at the helm.

That is why Apple's stock dropped as much as 7 percent in after-hours trading when Jobs' departure was announced.

In the company statement, Apple co-lead director Art Levinson on behalf of the board praised Jobs' "extraordinary vision and leadership" and "countless contributions to Apple's success," saying he would continue to serve the company with "unique insights, creativity and inspiration."

However, the statement, which also talked about Cook's outstanding performance, said nothing about Jobs' health.

His battle with pancreatic cancer, which has stretched over several years, has been of deep concern to Apple fans, investors and the company's board. Over the past two years, even board members have confided to friends their concern that Jobs, in his quest for privacy, wasn't being forthcoming with directors about the true condition of his health.

Jobs has been on medical leave since January 17, with his duties being filled by Cook, who was chief operating officer.

Some industry insiders privately expressed concern Jobs' relinquishing the CEO position was a clear signal he was too ill to keep up its punishing pace.

The 55-year-old Jobs had briefly emerged from his medical leave in March to unveil the latest version of the iPad and later to attend a dinner hosted by President Barack Obama for technology leaders in Silicon Valley. But his often-gaunt appearance had sparked questions about how bad his illness is and his ability to continue at Apple.

In each of Jobs' three health-related absences, Cook has taken over the helm. But the 50-year-old Alabama native, a former Compaq executive and an acknowledged master of supply-chain management, remains largely untested in Wall Street's view.

That's partly why, despite Cook being viewed as a safe bet to run Apple's sprawling empire, some still think his boss will be very badly missed.

One Silicon Valley CEO, who declined to be identified because of the sensitive issues involved, said the tone of Jobs' statement indicated his health might be worse than publicly known. The Apple chieftain has earned a reputation for commanding every aspect of operations -- from day-to-day running to broad strategic decisions -- suggesting he would not give up the job if he had a choice.

"It's really sad," the CEO told Reuters. "No one is looking at this as a business thing, but as a human thing. No one thinks that Steve is just stepping aside because he just doesn't want to be CEO of Apple anymore."

"It feels like another shoe is going to drop."

AGAIN, DEEP BENCH

While Jobs did not give details on the state of his health, oncologists who have not treated the Apple founder said he could be facing several problems tied to his rare form of pancreatic cancer and subsequent liver transplant. They include possible hormone imbalances or a recurrence of cancer that is harder to fight once the body has already been weakened

His resignation certainly marks the end of an era at Apple.

A college dropout, a Buddhist and a son of adoptive parents, he started Apple Computer with friend Steve Wozniak in the late 1970s.

The company soon introduced the Apple 1 computer. But it was the Apple II that became a huge success and gave Apple its position as a critical player in the then-nascent PC industry, culminating in a 1980 IPO that made Jobs a multimillionaire.

Despite the subsequent success of the Mac, Jobs' relationship with internal management soured, and in 1985 the board removed most of his powers and he left the company, selling all but one share of his Apple holdings.

Apple's fortunes waned after that. However, its purchase of NeXT -- the computer company Jobs founded after leaving Apple -- in 1997 brought him back into the fold. Later that year, he became interim CEO and in 2000, the company dropped "interim" from his title.

"Steve Jobs is the most successful CEO in the U.S. of the last 25 years," Google Inc Chairman Eric Schmidt said in a statement. "He uniquely combined an artists touch and an engineer's vision to build an extraordinary company.. one of the greatest American leaders in history."

Some Apple fans took to social media to express their reaction in crudely poetic, though somewhat poignant, terms. One Apple fan from Denmark posted on Facebook: "Good Job. I just ate an Apple. It was bittersweet. Guess I'll just have to Cook it from now on."

Analysts again expressed confidence in the Apple bench, headed by supply-chain maven Cook.

"I will say to investors: don't panic and remain calm, it's the right thing to do. Steve will be chairman and Cook is CEO," said BGC Financial analyst Colin Gillis.

Steve Jobs has resigned as CEO of Apple in a letter to Apple's Board of Directors. In his letter, Steve asks to remain Chairman of the Board and appoints Tim Cook as his successor. The board has approved these requests, effective immediately. Jobs will still be "active" at Apple and is expected to continue to be involved with company strategy.

To the Apple Board of Directors and the Apple Community:

I have always said if there ever came a day when I could no longer meet my duties and expectations as Apple’s CEO, I would be the first to let you know. Unfortunately, that day has come.

I hereby resign as CEO of Apple. I would like to serve, if the Board sees fit, as Chairman of the Board, director and Apple employee.

As far as my successor goes, I strongly recommend that we execute our succession plan and name Tim Cook as CEO of Apple.

I believe Apple’s brightest and most innovative days are ahead of it. And I look forward to watching and contributing to its success in a new role.

I have made some of the best friends of my life at Apple, and I thank you all for the many years of being able to work alongside you.
Art Levinson, chairman of Genentech and an Apple board member for more than 10 years, issued this statement on behalf of the board:

Steve's extraordinary vision and leadership saved Apple and guided it to its position as the world's most innovative and valuable technology company. Steve has made countless contributions to Apple's success, and he has attracted and inspired Apple's immensely creative employees and world class executive team. In his new role as Chairman of the Board, Steve will continue to serve Apple with his unique insights, creativity and inspiration.

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