The Mac and the iPhone could double or even triple their respective market shares in the next few years, according to analyst Shaw Wu of Sterne Agee.

According to Apple Insider, Agee thinks that Apple's growth is the "ultimate platform adoption story" and that the company's key product lines will go from strength to strength in the coming years.

Wu said in a note to investors that Apple has plenty of room for further growth, with just a four to five percent share of the overall mobile phone market and a similar proportion of the personal computer market. Further growth will depend on increasing penetration in international markets such as Greater China, Wu said.

"We think the beauty with the Apple platform story is the company doesn't need to win over everyone to continue success. The company just needs to continue winning a fair share of its vast end markets as more users get the Apple advantage of 'it just works better,'" Wu said.

Apple is the best-placed company to take advantage of three key technology trends, Wu says. These trends are mobile web access, cloud computing and the consumerisation of technology.

Wu also thinks that the iPhone 5 will be a bigger upgrade than expected - he reckons we'll see a dual-core processor, a larger screen, smaller form factor and more powerful camera when the next-generation iPhone is unveiled in September.