To summarize what you're saying in a sentence, desktops are a boon for IT departments. People often miss this factor, but an office full of desktops on a Windo

To summarize what you're saying in a sentence, desktops are a boon for IT departments. People often miss this factor, but an office full of desktops on a Windows Active Directory domain is probably the easiest way to manage a large office's computing experience. People often cite compatibility with legacy applications as the reason most offices are windows based, but in reality this is less true every day, as a most offices are heavily reliant on web services (for instance, my office uses a corporate GMail as opposed to MS Outlook). Features like Active Directory are Microsoft's real footholds, IMHO.