It seems that San Jose, California based Adobe Systems’ effort to get its Flash technology onto the Apple iPhone is getting litter longer; that’s what the Adobe CEO Shantanu Narayen's comments in Davos, Switzerland indicate.

In an interview in Davos, Narayen admitted that they are still working on to develop a workable version of Flash for the iPhone even after months of striving. Narayen said, "It's a hard technical challenge, and that's part of the reason Apple and Adobe are collaborating. The ball is in our court. The onus is on us to deliver."

It was, in March 2008, Adobe first announced that it was working on to bring Flash apps to the iPhone. In its statement, Adobe said, "To bring the full capabilities of Flash to the iPhone Web-browsing experience we do need to work with Apple beyond and above what is available through the SDK (the iPhone software development kit) and the current license around it."

In March 2008, Apple’s CEO Steve Jobs stated, “The PC version of Flash performs too slow to be useful on the iPhone, while the Flash Lite version for mobile phones "is not capable of being used with the Web."

In November, Adobe’s Chief Technology Officer Kevin Lynch said, "We are in the midst of evolving Flash Player 10 for mobile. We're taking the full Flash Player and making that run on the higher end of the mobile market. We're actually going to get 1 billion Flash-enabled phones by 2009." However, he didn’t comment anything about iPhone.

So, it’s been long time since company started working to develop workable Flash version for the iPhone, and Adobe CEO Shantanu Narayen's statement revealed that the company’s effort is still going on.