Impar don't know what big business you work for, but 99% of them modify windows OS for there own needs. The user interfaces where I work at have not changed in 10 years but the windows version is now on 7. Heavily modified IE code is the norm is big business that browser is then overlapped and locked as the UI that the end user sees. You can't even access the start menu as they don't need it. Even the Internet is a intranet with access heavily restricted. Win 7 will last to 2020 by which stage something else will be the choice of windows version. Windows 8,9 or even 10 it is unlikely to be.