Michael Vizard feels that the upgrades to vista and the windows server would naturally push an enterprise IT manager to think of managed services route. Its not about whether your IT team can or cannot handle the pressure, its about do you really want to do this? Outsourcing the work to a partner (an MSP) at a cost-effective rate, leaves you with enough time to pour your soul into running IT better than banging your head on server upgrades.
Link to Michael’s article (courtesy eweek channel insider):