I believe the issue is the beancounters cut down and limit helpdesk and then the policy changes where the amount of calls/tickets doubles, yet they are still supposed to have them all finished by the end of the day. This drives up support costs and puts the burden on the workers. If the employer refuses to pay for more support then those who need to get their email or other more appropriate business oriented task done will have to wait.
Worse, they now need to learn IOS, Andriod, and Blackberry in edition to Windows and Cisco stuff on their dime.
I can only imagine security issues of a single employee bringing in a netbook with a virus and having it spread all over the network. These are legitimate problems that these employers who bring them in are totally insulated from.
BYOD does not belong in the workplace. Maybe if they are important enough an external site can be used or something like OUtlook express so they can view emails on their phones but that is it. No bring your virii laden netbook from home and plug it in to the 3,000 user network and then cry foul at the lowly help desk guy for not foreseeing it.