AD is nothing to do with DESKTOP environment - which is what we were talking about. AD is the NETWORK infrastructure.

Windows is only the "best" desktop environment for business purely because most business use MS Office. Those businesses that DON'T use MS Office (and there a a surprising number, which is increasing with each "improvement" in Office releases), funnily enough would say that Windows is NOT the "best" desktop environment for business.

Hmm. I'm a Systems Accountant, and I've worked in several companies (some quite large) where I (and a number of other users) knew more than the "IT" dept! My wife's company for example had some IT staff who didn't know about the "stop -a" command to enable a blaster worm infected laptop to download the Blaster worm patch! They knew where the patch could be downloaded from but not how to stop the worm shutting the machine down! I had to tell the person whose machine was infected how to do it, and I don't work for the company!