Despite years of marketing pressure and products that are simpler to use and more widely available, desktop virtualisation hasn't taken off to the extent that vendors and analysts expected even a few years ago.
The bring-your-own-device movement among end users, on the other hand, has lit a fire under the market for mobile device virtualisation.
A survey released last month by telecommunications giant Mitel showed 90 percent of respondents expected virtualisation to become more important in their companies, with the priority being first in mobile phones, second in cloud computing and third in desktop computing.
A Frost & Sullivan survey released in this week showed that only 5 percent of the 18.3 million tablets sold in 2010 were used in business, but that number could reach 30 percent by 2015. A June, 2010 Frost & Sullivan survey showed 49 percent of respondents expect tablets and smartphones to become the end-user computing platform of choice within a few years.
Unfortunately, the number of virtualisation products available to connect those devices securely to corporate networks is far thinner than it appears from the marketing and hype surrounding the technology, says Ian Song, research analyst at IDC.
"Virtualisation on mobile devices requires some pretty low-level coding, especially because there are so many kinds of hardware and firmware, and it changes pretty fast," Song says. "Even if you're going to stick with just Android, like VMware plans to do, there are already a lot of different versions, and another comes every three or four months." Citrix and VMware Plans
Citrix and VMware are both moving fast on products that would make smartphones and tablets good virtualisation clients, but the rival firms are taking very different approaches.
VMware, as part of its Project Horizon mobile computing effort, is basing its mobile client on the Mobile Virtualisation Platform - a Type II hypervisor designed to run on top of an existing operating system to support one or more additional virtual-smartphone OS/application-sets on top of that. VMware's MVP is also designed to manage multiple profiles, to allow customers to switch from work to personal to other virtual environments - without losing configuration or applications set up for each.
Its Project Horizon, announced in August, creates a cloud-based set of personal configurations, applications and data that users can access from anywhere, from any device. Though primarily a desktop virtualisation product, it can also make BYOD setups far more flexible, by not relying on the phone to contain all the data and applications, according to VMware.
VMware's approach is to work with individual phone manufacturers to build its hypervisor onto their devices, focusing only on Android at this point.
VMware and LG Electronics introduced a virtualised Android phone in December that is expected to ship sometime early this year, followed by other LG Android devices.
A Speed Catch?
Type II hypervisors worked well enough on PCs, but far slower than "bare metal" Type I hypervisors because of the additional layer of software on top of the operating system, Song says.
On phones, which have much less processing power, Type I hypervisors could work much more effectively, but they depend on the ability of the developer to code them to an incredibly wide variety of hardware, Song says.
That's Citrix's strategy, and has been from the beginning, according to Citrix CTO Simon Crosby. The company has been shipping bare-metal hypervisor clients in its Receiver product line since it shipped an Android version in April, 2010 and plans to continue expanding the line.
Citrix has committed enough developers and resources not only to building the hypervisors, but also doing it quickly enough that a new Receiver version will be available any time a major new device ships, he says.
Even that won't solve the overall problem of having no standard hardware or firmware, however, Song says.
"With Android, because it's open and its hardware architecture is open, it's not that difficult to virtualise," he says. "The question is what happens when you get to a more closed architecture; I'm not even sure it's legal to virtualise an iPhone at the hardware level.
"And on software [with a Type II hypervisor], forget about it," Song says. "Apple is not going to let you come in and virtualise it to run another OS." To comment on this article, please email the editor.
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