If your company has any sort of lease/purchase lifecycle, this is where you be most effective in placing your OS upgrade. The problem is that you'll be supporting XP, Windows 7, and possibly 2000 for the next 2-3 years while you replace everyone's machines.

Corporate America resists change. Can you go to Windows 7? Sure. I just don't think businesses are going to go out and pay for 10,000 licenses to replace XP/2000 on all of their machines. The upgrades will more than likely happen with PC replacements, when the licenses are included with the purchase of the machine.

IIRC, if you use a Windows-based client OS to access AD, Exchange, Terminal Server, etc. the license you have for that client OS counts as a CAL for those services. I could be wrong on that, but In a Windows environment, a well deployed AD solution makes life WORLDS easier in terms of granting security, maintaining/tracking user accounts, and managing/securing computers. When I say securing there, I'm referring to Group Policies being used to automate a Windows Server Update Service (WSUS) environment, as well as "lock down" computers and prevent users from using certain parts of the OS. In many cases, this isn't necessary, but Group Policies also allow you to "push" out configuration changes with little to no effort. We use it to set the proxy server and local server exceptions in Internet Explorer. Hand configuring that would be HUGE pain. We also use it for application authentication. There's been a big push internally to move to AD authentication for all authentication. That makes life for users easy when they only need 1-2 passwords instead of one per application. YMMV.

Is that a terabyte in your pocket or are you just happy to see me?

I'll be here all week! Try the veal!