I hit a dilemma. I want to learn a server software for the advancement of my career. I am wondering if I should learn windows server 2003 or the new windows 2008. I'm asking because if I study windows 2008, will it teach me what I need to know about older systems, like 2003, or should I learn 2003 (which from my understanding is what most small business use) and get certified for it, then work on 2008. I will probably end up learning both eventually, unless 2008 teaches me everything I need to know about 2003. Or is a CompTIA Server+ 2005 a more logical way to go?