Among just PCs, employees are bringing in personal machines running Windows (63 percent), Mac OS X (37 percent) and Linux (14 percent).

All of this is a recipe for IT complexity. Fifty-nine percent of survey respondents report that their IT teams have taken on supporting more operating systems because of the devices that have been brought into work by employees.

Interestingly, 60 percent of respondents say they have seen a greater demand for support of Apple's Mac OS X for desktops and laptops as the iPhone and iPad have grown more popular. It seems the use of Apple mobile devices are feeding the entire Apple ecosystem -- clearly a major part of Apple's overall strategy.

But despite the benefits to workers, the consumerization of IT is a thorn in the side of most IT departments, according to the survey. Fears and concerns abound. The majority, 82 percent, report they are concerned about the use of personal devices for work purposes, with the biggest concern being potential network security breaches (62 percent), followed by possible loss of customer enterprise data (50 percent), potential theft of intellectual property (48 percent) and difficulty meeting compliance requirements (43 percent).

As for keeping an inventory of personal devices and applications, a majority of respondents feel they are not doing a good enough job. When asked, 64 percent reported they are not confident they know of all non-company owned devices and applications that are connecting to the network.