Worldwide media tablet sales to end users are forecast to total 118.9 million units in 2012, a 98% increase from 2011 sales of 60 million units, according to Gartner (http://www.gartner.com).

Apple's iOS continues to be the dominant media tablet OS, as it is projected to account for 61.4% of worldwide media tablet sales to end users in 2012, according to the research grouop. Despite the arrival of Microsoft-based devices to this market, and the expected international rollout of the Kindle Fire, Apple will continue to be the market leader through the forecast period.

"Despite PC vendors and phone manufacturers wanting a piece of the pie and launching themselves into the media tablet market, so far, we have seen very limited success outside of Apple with its iPad," says Carolina Milanesi, research vice president at Gartner. "As vendors struggled to compete on price and differentiate enough on either the hardware or ecosystem, inventories were built and only 60 million units actually reached the hands of consumers across the world. The situation has not improved in early 2012, when the arrival of the new iPad has reset the benchmark for the product to beat."

Microsoft tablets are projected to account for 4.1 percent of media tablet sales this year, and grow to 11.8% of sales by the end of 2016. Windows 8 is Microsoft's official entrance into the media tablet market.

"IT departments will see Windows 8 as the opportunity to deploy tablets on an OS that is familiar to them and with devices offered by many enterprise-class suppliers," Milanesi says. "This means that we see Windows 8 as a strong IT-supplied offering more so than an OS with a strong consumer appeal."

Gartner analysts said enterprise sales of media tablets will account for about 35% of total tablet sales sold in 2015. These sales will not be clearly defined as enterprise purchases. Gartner expects enterprises to allow tablets as part of their buy your own device (BYOD) program. More of these tablets will be owned by consumers who use them at work.

"This poses a big threat to vendors that thought about focusing on the enterprise market who will now have to become appealing to consumers as well," says Milanesi. "This is exactly the same trend that vendors such as RIM had to face in the smartphone market. The difference here is that tablets have been created for consumers first and then relied on an ecosystem of apps and services that make them more manageable in the enterprise. When the deployment will come from the IT department we believe that operating systems such as Windows 8 will have an advantage as long as they are not seen as a compromise in usability for the users."

Android tablets are forecast to account for 31.9% of media tablet sales in 2012. Gartner analysts said the main issue with Android tablets has been the lack of applications that are dedicated to tablets and therefore take advantage of their capabilities. Gartner's consumer survey data shows that consumers are running many of their apps on their mobile phones and their tablets.